Poet, LLC v. State Air Resourced Board ( 2017 )


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  • Filed 4/10/17
    CERTIFIED FOR PUBLICATION
    IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA
    FIFTH APPELLATE DISTRICT
    POET, LLC et al.,
    F073340
    Plaintiffs and Appellants,
    (Super. Ct. No. 09CECG04659)
    v.
    STATE AIR RESOURCES BOARD et al.,                              OPINION
    Defendants and Respondents;
    NATURAL RESOURCES DEFENSE
    COUNCIL, INC.,
    Intervener and Respondent.
    APPEAL from an order the Superior Court of Fresno County. Jeffrey Y.
    Hamilton, Jr., Judge.
    Wanger Jones Helsley, Timothy Jones, John P. Kinsey, and Dylan J. Crosby for
    Plaintiffs and Appellants.
    Xavier Becerra, Kamala D. Harris, Attorney General, Robert W. Bryne, Assistant
    Attorney General, Gavin G. McCabe, Supervising Deputy Attorney General, M. Elaine
    Meckenstock, Melinda Piling and Myung J. Park, Deputy Attorneys General, for
    Defendants and Respondents.
    Natural Resources Defense Council and David Pettit for Intervener and
    Respondent.
    -ooOoo-
    The California Global Warming Solutions Act of 2006 (Health & Saf. Code,
    § 38500 et seq.) established the first comprehensive greenhouse gas regulatory program
    in the United States. Its goal is to progressively reduce greenhouse gas emissions to 1990
    levels by 2020. The State Air Resources Board (ARB) was charged with achieving this
    goal. One of its actions was promulgating the low carbon fuel standards (LCFS)
    regulations that are the subject of this litigation.
    When ARB adopted the original LCFS regulations in 2009, it violated the
    California Environmental Quality Act (CEQA; Pub. Resources Code, § 21000 et seq.1).
    In 2013, we identified those violations and directed the issuance of a writ of mandate
    compelling ARB to take corrective action. (POET, LLC v. State Air Resources Bd.
    (2013) 
    218 Cal. App. 4th 681
    (Poet I).) Now, we consider whether ARB‘s actions
    satisfied that writ and corrected one of its CEQA violations. The specific question
    presented is whether ARB‘s disclosures about the project’s effects on biodiesel
    consumption, and the related increases in nitrogen oxide (NOx) emissions, satisfied
    paragraph 3 of the writ of mandate.
    The writ provisions were drafted by this court. Therefore, we interpret paragraph
    3 of the writ without deference to the trial court or ARB. We used the term ―project‖ in
    paragraph 3 of the writ in the same way it is used in CEQA, the Guidelines2 and CEQA
    case law. Stated generally, ―project‖ includes the whole of an activity directly
    undertaken by a public agency. More specifically, when the agency‘s activity involves a
    regulation (as compared to building a physical structure, such as a road or power plant),
    the whole of the activity constituting the ―project‖ includes the enactment,
    1      All unlabeled statutory references are to the Public Resources Code.
    2       ―Guidelines‖ refers to the regulations promulgated to implement CEQA, which are
    set forth in California Code of Regulations, title 14, section 15000 et seq. (§ 21083,
    subds. (a), (f) [―Office of Planning and Research shall prepare and develop proposed
    guidelines‖ and ―Secretary of the Resources Agency shall certify and adopt guidelines‖].)
    2.
    implementation and enforcement of the regulation. Here, the ―project‖ includes the
    whole of ARB‘s activity in promulgating and enforcing (1) the regulations originally
    adopted in 2009 and (2) the replacement regulations adopted in 2015 in response to the
    writ of mandate issued pursuant to Poet I.
    Consequently, ARB‘s view that the ―project‖ included only the regulations
    adopted in 2015 was wrong and explains why it incorrectly chose 2014 NOx emissions as
    the baseline. The proper baseline for a project normally is the conditions existing when
    the environmental review of the project is commenced. Here, ARB‘s review commenced
    before the regulations were first approved in 2009. Thus, ARB‘s use of 2014 NOx
    emissions as the baseline was improper and generated flawed results when that baseline
    was plugged into the formula for calculating environmental change. Specifically, NOx
    emissions in 2014 were higher than the NOx emissions prior to the 2009 approval of the
    LCFS regulations, which caused ARB‘s most recent calculations of the yearly changes in
    NOx emissions to be too low and thus misleading. ARB‘s flawed analysis of NOx
    emissions did not cure the CEQA violation identified in Poet I or comply with paragraph
    3 of the writ.
    Leaving the technical language of CEQA aside, the purpose of the writ was to
    provide the public and decisions makers with information omitted from the original
    environmental disclosure documents in 2009. Thus, one way to evaluate ARB‘s attempt
    at compliance is to ask whether the revised environmental disclosure documents provided
    all of the information that would have been provided if the original documents had
    complied with CEQA. The answer is ―no,‖ ARB‘s revised documents did not provide
    that information. In contrast to ARB‘s revised documents, CEQA-compliant original
    documents would not have used a 2014 baseline and would have shown that NOx
    emissions in 2015 and later were larger than the baseline, not smaller. Accordingly, we
    conclude the writ should not have been discharged and the CEQA violation continues
    uncorrected.
    3.
    The second major issue in this appeal is how to remedy ARB‘s failure to comply
    with CEQA and the writ. Pursuant to our discretionary authority to fashion appellate
    relief, we reverse the order discharging the writ and remand for further proceedings under
    a modified writ. The modifications direct ARB to address NOx emissions from biodiesel
    in a manner that complies with CEQA, including the use of a proper baseline. As to the
    fate of the current version of the LCFS regulations, only the provisions addressing diesel
    fuel and its substitutes3 were affected by the flawed analysis of NOx emissions. Thus,
    the remainder of the LCFS regulations will be allowed to remain in effect. The
    provisions addressing diesel fuel and its substitutes appear, on balance, to provide
    environmental benefits that outweigh the potential adverse impacts and, therefore, we
    will not invalidate those provisions. Instead, the standards for diesel fuel and its
    substitutes in effect for 2017 shall remain the operative standards until the modified writ
    is discharged.
    We therefore reverse the order discharging the writ and remand for further
    proceedings.
    FACTS AND PROCEEDINGS
    Overview of LCFS Regulations
    The goal of the LCFS regulations is to progressively reduce the greenhouse gas
    emissions from transportation fuels used in California. (Cal. Code Regs., tit. 17,
    § 95480.) The LCFS regulations use carbon intensity values to approximate the
    greenhouse gas emissions generated from all stages of producing, transporting and
    consuming a fuel—that is, the fuel‘s complete lifecycle. (Cal. Code Regs., tit. 17,
    § 95484 [average carbon intensity requirements].) Regulated parties must meet average
    3      The two main substitutes for conventional diesel are biodiesel and renewable
    diesel. Biodiesel and renewable diesel have different chemical structures and are made
    by different chemical processes. When used, renewable diesel emits less particulate
    matter and NOx than conventional diesel. (Poet 
    I, supra
    , 218 Cal.App.4th at p. 732, fn.
    37.) In contrast, biodiesel emits more NOx than renewable diesel or conventional diesel.
    4.
    carbon intensity requirements for the gasoline and diesel fuel they handle each calendar
    year. (Id., subd. (a).) Carbon intensity is stated as grams of carbon dioxide equivalent
    per megajoule. For example, the 2017 average carbon intensity requirement for diesel
    fuel and its substitutes is 98.44 grams of carbon dioxide equivalent per megajoule. (Id.,
    subd. (c).) In contrast, the carbon intensity value assigned to conventional diesel, based
    on average crude oil and average refinery efficiencies, is 102.01 grams of carbon dioxide
    equivalent per megajoule. (Cal. Code Regs., tit. 17, § 95488, subd. (c) [lookup table].)
    Thus, a regulated party handling only conventional diesel fuel would not meet the carbon
    intensity requirement for 2017. That regulated party would need to handle diesel fuel and
    substitutes assigned a lower carbon intensity. For instance, some biodiesels are assigned
    carbon intensity values of 37.54 (animal fat feedstock) or 56.95 (plant oil feedstock).
    Most providers of petroleum and biofuels in California are subject to the reporting
    and carbon intensity value requirements of the LCFS regulations. (Cal. Code Regs., tit.
    17, §§ 95485 [demonstrating compliance], 95491 [reporting and recordkeeping].)
    Regulated parties file annual reports to show they have complied. The reports (1)
    calculate the average carbon intensity of the fuels handled by the regulated party and (2)
    determine the credits or deficits generated by comparing that average to the carbon
    intensity value set as the standard for that year. (Cal. Code Regs., tit. 17, § 95486
    [generating and calculating credits and deficits].) If credits are generated, they can be
    deposited into an account maintained by ARB and, once banked, the credits may be (1)
    retained indefinitely, (2) retired to offset deficits and meet future compliance
    requirements, or (3) sold to other regulated parties. (Id., subd. (a)(1).) Transactions in
    carbon intensity credits are subject to public disclosure and other requirements. (Cal.
    Code Regs., tit. 17, § 95487.) ARB maintains a website reporting the monthly price and
    transaction volume of LCFS credits.
    5.
    First Appeal
    The history of the original LCFS regulations,4 from the enactment of the
    authorizing legislation in 2006 through April 2010, is described in the ―FACTS‖ section
    of Poet 
    I, supra
    , 218 Cal.App.4th at pages 699 through 707 and need not be repeated
    here. The original LCFS regulations became effective in 2010 and were set forth in
    sections 95480 through 95490 of title 17 of the California Code of Regulations.
    In December 2009, plaintiffs POET, LLC and James M. Lyons filed this litigation
    to challenge the LCFS regulations, alleging violations of CEQA and California‘s
    Administrative Procedure Act (APA; Gov. Code, § 11340 et seq.). In November 2011,
    the trial court denied plaintiffs‘ petition for writ of mandate and filed a judgment in favor
    of ARB. Plaintiffs appealed.
    In May 2013, oral argument was held in the appeal. In June 2013, this court
    issued an order requesting input from counsel regarding the terms of the disposition and
    attached a tentative disposition. We asked counsel to make certain assumptions,
    including that certain CEQA violations had occurred and the LCFS regulations would be
    allowed to continue to operate. We stated our preference for a disposition ―drafted so the
    superior court can take the language from the disposition and insert it into the peremptory
    writ of mandate‖ and asked counsel to take this into account when proposing changes or
    alternatives to the tentative disposition. Our order sought input on six topics of interest,
    including (1) maintaining the status quo and whether the 2014 standards should have
    4      For purposes of this opinion, the term ―original LCFS regulations‖ refers to the
    regulations adopted by ARB in 2009, which the Office of Administrative Law stated
    became effective on January 12, 2010, and the minor amendments adopted by ARB in
    2010, which the Office of Administrative Law stated became effective on April 15, 2010.
    (Poet 
    I, supra
    , 218 Cal.App.4th at pp. 706-707.)
    In contrast, we use the term ―2015 LCFS regulations‖ to mean the LCFS
    regulations adopted by ARB in 2015, which went into effect on January 1, 2016. ARB
    refers to the 2015 LCFS regulations as the ―new LCFS regulations,‖ while plaintiffs
    describe them as the ―Readopted LCFS Regulation.‖
    6.
    been allowed to go into effect and (2) the framework for ARB‘s analysis of NOx
    emissions on remand.
    On July 15, 2013, our opinion in Poet I was filed. We reversed the denial of
    plaintiffs‘ petition for writ of mandate and remanded for the issuance of a writ directing
    ARB to correct its CEQA and APA violations. In August 2013, we denied ARB‘s
    petition for rehearing. The next month, ARB filed a petition for review in the California
    Supreme Court. On November 27, 2013, our high court denied ARB‘s petition for
    review and, later that day, this court issued a remittitur.
    In December 2013, plaintiffs submitted a proposed peremptory writ to the trial
    court. On January 6, 2014, the trial court signed and filed the proposal. On February 10,
    2014, the trial court responded to ARB‘s objections by filing a modified version of the
    peremptory writ of mandate (February 2014 writ),5 which is the operative writ for
    purposes of this appeal.
    As directed by the disposition in Poet I, the February 2014 writ compelled ARB to
    take action to correct its violations of CEQA. The writ provision at the center of this
    appeal is described in part I.C, post. We also took the unusual step of allowing the
    original LCFS regulations to remain in effect despite the CEQA violations. (See Poet 
    I, supra
    , 218 Cal.App.4th at pp. 763, 767.) At the time, we estimated that, on balance,
    leaving the LCFS regulations in place would provide more protection for the environment
    than suspending their operation pending ARB‘s compliance with CEQA. (Id. at p. 762.)
    We stated that ―the emissions of greenhouse gases will be less if the LCFS regulations
    are allowed to remain in effect, rather than being suspended. The possibility that the use
    of biodiesel will produce more NOx emissions than the petroleum-based diesel that it
    5      The modifications affected only paragraph 5 of the writ and are not relevant to this
    appeal.
    7.
    replaces does not justify throwing out the entire LCFS regulation.‖ (Id. at pp. 762-763.)6
    Consequently, we decided to preserve the status quo pending ARB‘s compliance with the
    writ by directing ARB to continue to adhere to the LCFS regulations standards in effect
    for 2013 until its corrective action was completed. (Id. at p. 767.)
    Corrective Action Relating to NOx Emissions
    The portion of the February 2014 writ relevant to this appeal concerns the
    deficiencies in ARB‘s analysis of NOx emissions and mitigation measures for any
    significant adverse environmental impact resulting from increased NOx emissions.
    ARB‘s actions to comply with the writ and remedy its CEQA violations are described in
    part I.D, post.
    ARB’s Return, Discharge Order, Stay Requests and Appeal
    In November 2015, ARB filed its return to the February 2014 writ. (See pt. I.D.4,
    post.) In January 2016, the trial court issued an order discharging the writ. (See pt. I.D.5,
    post.) On February 5, 2016, plaintiffs filed a motion to stay the order discharging the writ
    pending an appeal. On February 29, 2016, the trial court‘s order denying the motion for a
    stay was served on the parties without holding a hearing.
    On March 4, 2016, plaintiffs filed a notice of appeal from the order discharging
    the writ and the order denying their motion for stay pending appeal. Plaintiffs then filed
    a petition for writ of supersedeas requesting a stay of the order discharging the writ
    pending a decision in this appeal. We denied the writ and request for a stay, even though
    plaintiffs established a strong probability of prevailing in this appeal because their
    6      Our concern about the overall impact of suspending the LCFS regulations can be
    described as the-baby-with-the-bathwater problem. In other words, we were concerned
    that suspending the LCFS regulations might result in a loss of the baby (i.e., the reduction
    of various greenhouse gases) to resolve the problem of dirty bathwater (i.e., an improper
    CEQA analysis of NOx emissions).
    8.
    showing relating to the balance of harms, which encompasses the-baby-with-the-
    bathwater problem, was insufficient.
    DISCUSSION
    I.     COMPLIANCE WITH THE WRIT OF MANDATE
    A.     Standard of Review
    1.     Parties’ Contentions
    Plaintiffs contend that, under the applicable standard of review, the issue presented
    is whether ARB prejudicially abused its discretion in its attempt to demonstrate
    compliance with the February 2014 writ. Plaintiffs refer to the abuse of discretion
    standard set forth in section 21168.5, which requires the agency to support its findings
    with substantial evidence and to proceed in the manner required by law.
    ARB contends the only issue on appeal is whether the superior court erred in
    discharging the writ. (Los Angles Internat. Charter High School v. Los Angeles Unified
    School Dist. (2012) 
    209 Cal. App. 4th 1348
    , 1355 [―issue is whether the trial court erred in
    ruling that the respondent … complied with the writ‖].) To resolve this issue, ARB urges
    us to focus on its response to the writ and the superior court‘s assessment of that
    response. ARB contends the discharge order can be reversed only if ARB‘s action
    pursuant to the writ was so palpably unreasonable and arbitrary as to indicate an abuse of
    discretion as a matter of law. (Id. at pp. 1355-1356.)
    The parties‘ slightly different descriptions of the standard of review does not
    present an authentic controversy because, at bottom, both regard the fundamental issue as
    whether ARB‘s action complied with the writ and contend that action is reviewed for an
    abuse of discretion. We agree that the abuse of discretion standard applies to ARB‘s
    actions because ARB‘s attempt to comply with the writ is, for all practical purposes, an
    attempt to comply with CEQA. (§ 21168.5.)
    9.
    2.       General Principles Regarding Abuse of Discretion Standard
    Our conclusion that the abuse of discretion standard of review applies does not
    complete the description of the principles applied to evaluate ARB‘s actions. ―The abuse
    of discretion standard is not a unified standard; the deference it calls for varies according
    to the aspect of [the agency‘s action] under review.‖ (Haraguchi v. Superior Court
    (2008) 
    43 Cal. 4th 706
    , 711.) If findings of fact (whether express, implied or both) are
    challenged for lack of evidentiary support, the appellate court determines whether the
    findings are supported by substantial evidence. (Vineyard Area Citizens for Responsible
    Growth, Inc. v. City of Rancho Cordova (2007) 
    40 Cal. 4th 412
    , 426-427 (Vineyard).) In
    contrast, if ARB‘s resolution of a question of law is challenged, the appellate court
    subjects that question of law to an independent (i.e., de novo) review on appeal. (Id. at p.
    427.) For example, the proper construction of CEQA presents a question of law subject
    to independent review on appeal. (Poet 
    I, supra
    , 218 Cal.App.4th at p. 748.)
    3.       Interpreting the February 2014 Writ
    The parties‘ dispute over ARB‘s compliance with the February 2014 writ is
    primarily a conflict about how to interpret the writ‘s provisions. We drafted the language
    in the writ that is the subject of the present dispute and, more fundamentally, we
    identified the CEQA violations the language was designed to remedy. Thus, we are in
    the best position to determine its meaning and explain its purpose. (Cf. Protect Our
    Water v. County of Merced (2005) 
    130 Cal. App. 4th 488
    , 494 [―we are in as good a
    position as, and perhaps in a better position than, the trial court to decide‖ an issue that
    turns on the import of our earlier published opinion].) Accordingly, we conclude the
    interpretation of the writ should be treated as a question of law subject to our independent
    review and ARB‘s interpretation should be given no deference. In short, the abuse of
    discretion standard of review does not allow ARB to misconstrue the directions given by
    this court in Poet I.
    10.
    B.     The CEQA Violation Relating to NOx Emissions
    The California Global Warming Solutions Act of 2006 charged ARB with
    regulating the sources of emissions of greenhouse gases. To reduce greenhouse gas
    emissions from the fuel used for transportation, ARB adopted a number of regulations,
    including the LCFS regulations. Diesel fuel was one of the transportation fuels addressed
    by the original LCFS regulations. ARB thought it could reduce the greenhouse gas
    emissions of diesel fuel by promoting the use of biodiesel, either as a substitute for, or
    blended with, petroleum-based diesel fuel. (Poet 
    I, supra
    , 218 Cal.App.4th at p. 731.)
    Consequently, the original LCFS regulations attempted to encourage the production and
    use of biodiesel.
    The environmental disclosure document7 generated by ARB in connection with
    proposing and adopting the original LCFS regulations violated CEQA by impermissibly
    deferring (1) the analysis of potential increases in the emission of NOx resulting from
    increased biodiesel use and (2) the analysis and formulation of mitigation measures for
    any significant increases in emissions. (Poet 
    I, supra
    , 218 Cal.App.4th at pp. 698-699,
    731-741.) These delays were not, standing alone, violations of CEQA. However, when
    the original LCFS regulations went into effect before the deferred analysis was
    completed, CEQA was violated. Without an analysis of NOx emissions and a
    determination of whether the emissions created a significant environmental effect (by
    7     Most of the environmental disclosures and discussion were included in the draft
    Environmental Analysis attached to the Initial Statement of Reasons (ISOR) published on
    March 5, 2009. The ISOR and draft Environmental Analysis are comparable to a draft
    environmental impact report (EIR). (See Poet 
    I, supra
    , 218 Cal.App.4th at pp. 701, 710.)
    Similarly, the December 2009 Final Statement of Reasons and the final Environmental
    Analysis are comparable to a final EIR. (Id. at p. 733.)
    11.
    itself or cumulatively),8 the implementation of the original LCFS regulations created the
    possibility that unmitigated adverse environmental consequences were occurring.
    ARB‘s 2009 draft environmental disclosure document did not ignore the question
    of ―whether the substitution of biodiesel for petroleum-based diesel would increase
    emissions of NOx.‖ (Poet 
    I, supra
    , 218 Cal.App.4th at p. 704.) Instead, ARB
    sidestepped and never reached the question of whether any increase would constitute a
    ―‗significant effect on the environment.‘‖ (§ 21083, subd. (b).) ―ARB‘s staff assumed
    that there would be no increase in the NOx emissions based on the position that, after
    conducting a test program for biodiesel, ARB would institute regulations setting fuel
    specifications for biodiesel that would ensure NOx emissions did not increase.‖ (Poet 
    I, supra
    , at pp. 704-705, italics added.)
    The public response to ARB‘s release of the draft environmental disclosure
    document included comments challenging the assumption that promoting the use of
    biodiesel would not increase NOx emissions. (Poet 
    I, supra
    , 218 Cal.App.4th at p. 705.)
    ―In response to these comments, ARB reiterated its position that it would ‗ensure that
    biodiesel fuel use does not increase NOx emissions significantly by promulgating a new
    motor vehicle fuel specification for biodiesel.‘‖ (Ibid.)
    ARB‘s assurance was an empty promise. The LCFS regulations were put into
    effect without any specifications for biodiesel sold in California. In April 2009, the
    Board9 attempted to have the specifications ready in time by passing a resolution
    8       Unless the context requires otherwise, subsequent references in this opinion to the
    significance of an effect on the environment include significance based on the three
    conditions listed in section 21083, subdivision (b). Thus, the references to whether an
    increase in NOx emissions is significant includes whether the incremental increase
    attributable to the project is ―cumulatively considerable‖ for purposes of section 21083,
    subdivision (b)(2). (See Guidelines, §§ 15130 [discussion of cumulative impacts], 15355
    [definition of cumulative impacts].)
    9      For purposes of this opinion, ―Board‖ refers to the group of individuals acting in
    that group‘s capacity as the governing entity of ARB. Under this narrow definition,
    12.
    directing motor vehicle fuel specifications be proposed by December 2009. (Poet 
    I, supra
    , 218 Cal.App.4th at pp. 705, 733 [Resolution 09-31].) As the complexities of
    creating specifications that reduced biodiesel‘s emissions unfolded and it became clear
    that deadline could not be met, ARB stated that the adoption of fuel specifications for
    biodiesel was ―‗now tentatively scheduled for 2010.‘‖ (Id. at p. 734.) This revised
    schedule was not met. A biodiesel emissions study was conducted and the report from
    that study was not issued until October 2011. (Ibid.) By June 2013 (shortly before our
    decision in Poet I), no regulation containing fuel specifications for biodiesel had been
    adopted. (Ibid.) Consequently, at that time, the LCFS regulations had been in effect
    since January 2010 (1) without the completion of the CEQA-required analysis of whether
    increased biodiesel use would increase NOx emissions and (2) without any fuel
    specification regulations to mitigate increases in NOx emissions that otherwise might
    occur from increased use of biodiesel.
    C.     The Disposition from Poet I
    Our decision in Poet I dealt with the foregoing CEQA violation involving NOx
    emissions from biodiesel and with other CEQA violations. It (1) reversed the judgment
    denying plaintiffs‘ writ petition; (2) remanded the matter for further proceedings; (3)
    directed to trial court to grant plaintiffs‘ petition and issue a writ of mandate; and (4)
    specified terms to be included in the writ of mandate. (Poet 
    I, supra
    , 218 Cal.App.4th at
    p. 766.) The terms in the writ required ARB to set aside its approval of the LCFS
    regulations.10 (Ibid.) In addition, ARB was required to select a single decision maker to
    complete the project‘s environmental review before reapproving the LCFS regulations or
    Board is not synonymous with ARB, a public agency. (See Poet 
    I, supra
    , 218
    Cal.App.4th at p. 705, fn. 12.)
    10     Setting aside an approval is different from setting aside (i.e., suspending or
    invalidating) the regulations.
    13.
    approving a modified version of the regulations. (Id. at pp. 765, 767.) The third
    numbered paragraph in the disposition compelled ARB to:
    ―Address whether the project will have a significant adverse effect on the
    environment as a result of increased NOx emissions, make findings
    (supported by substantial evidence) regarding the potential adverse
    environmental effect of increased NOx emissions, and adopt mitigation
    measures in the event the environmental effects are found to be
    significant.‖ (Id. at p. 767.)
    This language was tracked in paragraph 3 of the trial court‘s February 2014 writ
    (paragraph 3), which stated:
    ―ARB shall address whether the project will have a significant adverse
    effect on the environment as a result of increased NOx emissions, make
    findings (supported by substantial evidence) regarding the potential adverse
    environmental effect of increased NOx emissions, and adopt mitigation
    measures in the event the environmental effects are found to be
    significant.‖
    Whether ARB complied with the paragraph 3 and what appellate relief is
    appropriate if ARB did not comply are the two main issues in the appeal.
    D.     ARB‘s Actions to Comply with Writ
    1.     ARB’s Modified Regulations
    ARB‘s attempts to comply with the February 2014 writ (which included preparing
    a revised analysis of NOx emissions from biodiesel) preceded its approval of a modified
    version of the LCFS regulations, rather than a reapproval of the original version without
    changes. The possibility of modification was recognized in Poet I, where we stated that
    ARB might exercise its discretion on remand by ―reapproving the LCFS regulations or a
    modified version of those regulations.‖ (Poet 
    I, supra
    , 218 Cal.App.4th at p. 765.)
    Before our decision in Poet I was filed, ARB was holding public workshops to discuss
    regulatory changes and amendments to the LCFS regulations.
    From 2013 through September 2015, ARB‘s staff held five overarching
    workshops to discuss the LCFS regulations as a whole and 16 topic-specific workshops
    14.
    to discuss proposed revisions. On December 30, 2014, an initial statement of reasons
    was released to the public in support of ARB‘s staff‘s proposal to readopt the LCFS
    regulations. Attached as an appendix was a draft Environmental Analysis of (1) the
    proposed LCFS regulations and (2) newly proposed regulations addressing alternative
    diesel fuels (ADF).11 After a 45-day comment period and a public hearing in February
    2015, the Board directed modifications be made to the proposed regulations. After
    another comment period, the Board held a public hearing on September 24, 2015, and
    continued its consideration of the proposed LCFS and ADF regulations until the next day.
    On September 25, 2015, the Board adopted resolutions that finalized its
    rulemaking determinations. The Board certified the final Environmental Analysis for the
    proposed LCFS regulations and ADF regulations, stating it met the requirements of
    CEQA. Based on the final Environmental Analysis (which is described in the next
    section of this opinion), the Board adopted (1) a set of findings and statement of
    overriding considerations and (2) the modified version of the LCFS regulations referred
    to in this opinion as the ―2015 LCFS regulations.‖ (See fn. 4, ante.) The findings
    addressed NOx emissions by stating: ―The E[nvironmental Analysis] found that while
    use of biodiesel can increase NOx emissions in some engines, depending in part on
    feedstock and blend level, total NOx emissions from biodiesel will decline from the 2014
    baseline level under the proposed LCFS and ADF. Therefore, the Board finds that the
    use of biodiesel consistent with the proposed ADF will not result in a significant adverse
    impact to air quality.‖
    The 2015 LCFS regulations took effect on January 1, 2016. They are set forth in
    sections 95480 through 95497 of title 17 of the California Code of Regulations.
    11     The ADF regulations are set forth in sections 2293 through 2293.9 of title 13 of
    the California Code of Regulations and their purpose is ―to establish a comprehensive,
    multi-stage process governing the commercialization of alternative diesel fuels (ADF) in
    California.‖ (Cal. Code of Regs., tit. 13, § 2293; see pt. II.F.3, post.)
    15.
    2.     Final Environmental Analysis
    ARB‘s final Environmental Analysis stated that ―adoption of the proposed LCFS
    and ADF regulations would be anticipated to result in changes from the 2014 baseline
    emissions level for several criteria air pollutants (e.g., emissions from the additional use
    of biodiesel and renewable diesel fuels).‖12
    The final Environmental Analysis also stated:
    ―Biodiesel and renewable diesel fuels have been found to reduce
    [particulate matter] emissions relative to conventional diesel. Renewable
    diesel has been found to decrease NOx relative to conventional diesel;
    however, biodiesel has been found to increase NOx emissions in some
    cases, depending on feedstock and type of engine [] used.‖
    The final Environmental Analysis described the 2014 baseline conditions by
    stating approximately 65 million gallons of biodiesel and 114 million gallons of
    renewable diesel were consumed in California in 2014.13 Next, it compared emissions
    from the combination of these diesel fuels with emissions from conventional diesel fuel
    to produce an estimate of what the emissions would have been if only conventional diesel
    fuel had been used. This comparison led ARB to conclude the use of the foregoing
    volumes of biodiesel and renewable diesel (taking into account the use of new technology
    diesel engines) increased NOx emissions of about 1.2 tons per day and decreased
    particulate matter (PM) about 0.8 tons per day. These figures do not describe the changes
    12     Federal regulations define a ―[c]riteria pollutant‖ as ―a pollutant for which the
    Administrator [of the Environmental Protection Agency] has promulgated a national
    ambient air quality standard pursuant to 42 U.S.C. 7409 (i.e., ozone, lead, sulfur dioxide,
    particulate matter, carbon monoxide, nitrogen dioxide).‖ (40 C.F.R. § 52.31(b)(4).)
    Nitrogen dioxide is one form of NOx.
    13     ―In 2008, approximately 4.2 billion gallons of diesel fuel were consumed in
    California, while the state‘s total commercial biodiesel production capacity was
    approximately 35 million gallons per year.‖ (Poet 
    I, supra
    , 218 Cal.App.4th at pp. 731-
    732.) The final Environmental Analysis updated the information about production
    capacity by stating: ―In 2013, nine biodiesel producers had an annual capacity of 61
    million gallons.‖ Thus, in a span of five years, biodiesel production capacity increased
    about 75 percent.
    16.
    in emissions of NOx and PM caused by the version of the LCFS regulations in effect in
    2014, because the final Environmental Analysis did not take the additional analytical step
    of separating the increases in biodiesel and renewable diesel usage caused by the LCFS
    regulations from the increases in usage caused by other factors, such as the incentives
    created by federal regulations for fuel standards and federal tax incentives. In other
    words, the emission comparison made was between (1) an estimate of the emissions of all
    diesel fuel and its substitutes used in 2014 and (2) a hypothetical emissions profile that
    would have been generated if conventional diesel had replaced all of the biodiesel and
    renewable diesel fuel used in 2014.
    The final Environmental Analysis‘s reference to biodiesel‘s ―feedstock‖ as a factor
    affecting NOx emissions might encompass both the source of the organic matter (e.g.,
    soybean, cottonseed, tallow, restaurant grease) used to produce the biodiesel and the rate
    at which the biodiesel is blended with conventional diesel. (See Poet 
    I, supra
    , 218
    Cal.App.4th at pp. 732-733.) A blend of 5 percent biodiesel and 95 percent conventional
    diesel fuel (B5) is the most common blend level in California. Blends of 20 percent or
    less of biodiesel (B20) generally can be used without engine modifications. Biodiesel, by
    itself, usually is considered a blendstock rather than a fuel blend, although it can be used
    in some engines built after 1994, provided certain engine parts such a gaskets and hoses
    are made from biodiesel-compatible materials.
    The final Environmental Analysis stated that if the proposed ADF and LCFS
    regulations were adopted in 2015, ARB‘s staff predicted future decreases in total NOx
    emissions from biodiesel and renewable diesel. Table 4-1 in the final Environmental
    Analysis set forth the projected changes in statewide NOx emissions for each year from
    2014 through 2022. These projected changes were attributed to the total use of biodiesel
    and renewable diesel, not the incremental increase in use of these fuels caused by the
    ADF and LCFS regulations. Using 2014 as a baseline, the projected changes in net NOx
    emissions ranged from a reduction of 0.1 tons per day in 2015 to a reduction of 1.3 tons
    17.
    per day in 2022. Based on the progressively declining emissions of NOx and the
    projected reductions in other criteria pollutants, the final Environmental Analysis
    concluded the long-term impacts on air quality would be beneficial—that is, the
    regulations would not have an adverse environmental impact. We note that the final
    Environmental Analysis did not attempt to allocate the increased usage of biodiesel and
    renewable diesel between (1) the ADF and LCFS regulations and (2) other causes. Such
    an allocation was not made because ARB determined that the projected increased use of
    these fuels, whatever the cause, reduced air pollutants, including NOx. This reduction
    led to the conclusion that the environmental impact was not adverse.
    The final Environmental Analysis attempted to justify its use of the 2014 baseline
    for analyzing NOx emissions by discussing the possibility of comparing project NOx
    emissions to conditions existing in 2009—the year ARB prepared and adopted the
    original LCFS regulations. The final Environmental Analysis stated:
    ―In the interest of public disclosure, ARB staff examined the current and
    expected future emissions of NOx from biodiesel relative to the NOx
    emissions from biodiesel that were occurring prior to the adoption of the
    original LCFS (2009). In 2009, there were few [new technology diesel
    engines], no renewable diesel, and little biodiesel in California, so the NOx
    emissions from biodiesel were minimal. Staff re-evaluated the 2009 data
    and determined that NOx emissions were approximately 0.3 [tons per day]
    greater than reported in the Draft ISOR and E[nvironmental Analysis].
    However, since 2009, NOx emissions from biodiesel have increased with
    the increased use of biodiesel resulting from multiple incentives related to
    biodiesel since 2009. Thus, it is unclear and impossible to determine what
    portion of the increase in use is attributable to the original LCFS.‖
    (Underlining omitted.)
    This discussion continued with a description of the incentives created by federal
    regulations for fuel standards and federal tax incentives. The final Environmental
    Analysis stated the view of ARB‘s staff that the economic incentives in the federal
    measures were more instrumental than the LCFS regulations in bringing biodiesel to
    California post-2009. The final Environmental Analysis stated California‘s proportionate
    18.
    share of the national supply of fuel was approximately 11 percent and noted California
    did not use its proportionate share of the nation‘s biodiesel, but used more that its
    proportionate share of renewable diesel. Because renewable diesel has lower NOx
    emissions, California‘s emission of NOx is less than if it used its proportionate share of
    biodiesel and renewable diesel. The final Environmental Analysis concluded that the
    increased use of renewable diesel, combined with increased new technology diesel engine
    adoption, ―will cause the biodiesel-related NOx emissions in California to continue to
    decrease and ultimately return to 2009 levels by 2023.‖14 In view of the other factors
    promoting alternative fuels, the final Environmental Analysis also concluded ―it is
    certainly possible that biodiesel use in California would continue at or near existing
    levels—or even increase—in the absence of an LCFS regulation.‖
    3.     Comments and ARB’s Responses
    Another place where NOx emissions were addressed is the public comments to the
    draft Environmental Analysis and ARB‘s responses. Those comments included a
    challenge to ARB‘s use of a 2014 baseline to analyze the impacts of the 2015 LCFS
    regulations. One comment asserted an earlier baseline should have been used and an
    assessment made of the environmental changes between the adoption of the original
    LCFS regulations and the adoption of the 2015 LCFS regulations. ARB‘s response to the
    comment stated that an environmental baseline predating the beginning of the 2015
    administrative proceedings (1) would be misleading, (2) was not required by law, and (3)
    was not required by Poet I. ARB‘s response stated it did not agree that an earlier
    ―baseline would yield meaningful information for environmental analysis.‖
    Another comment interpreted the information provided in the draft Environmental
    Analysis to mean the readoption of the LCFS regulations would result in additional NOx
    14    The reference to ―biodiesel-related NOx emissions‖ probably was meant to cover
    the NOx emissions from both biodiesel and renewable diesel, not just biodiesel.
    19.
    emissions of 1.29 tons per day. ARB‘s response explained that the figure of 1.29 tons per
    day for 2015 appearing in its disclosure documents represented the NOx emissions
    attributable to the use of biodiesel blends. The figure was higher than the NOx emissions
    that would have occurred if only conventional diesel was used to fulfill diesel fuel
    demand in California. As biodiesel was already used in 2015 to fulfill California‘s diesel
    fuel demand, ARB‘s response stated:
    ―[T]he emissions the commenter refers to are already occurring as part of
    the current conditions. [¶] Thus, the 2014 and 2015 NOx emissions (1.35
    [tons per day] in 2014 and 1.29 [tons per day] in 2015) associated with
    biodiesel use are not NOx increases resulting from the implementation of
    the proposed regulation starting in 2016, but are estimated emissions
    associated with current conditions. For purposes of the E[nvironmental
    Analysis], ARB analyzed impacts against 2014 conditions, the time when
    the environmental analysis began. ARB staff‘s analysis of NOx emissions
    from 2014 through 2023 (displayed in Table B-1), shows that NOx
    emissions would decrease over time with the implementation of the
    regulatory proposal.‖
    In other words, the 1.29 tons per day of NOx emissions referred to in the comment
    were not incremental NOx emissions caused in 2015 by the LCFS regulations operating
    at that time. When the total of 1.29 tons per day was compared to the 1.35 tons per day
    from 2014, it showed NOx emissions were decreasing.
    Another comment raised the subject of cumulative impacts. (See § 21083, subd.
    (b)(2); Guidelines, §§ 15130 [discussion of cumulative impacts], 15355 [definition of
    cumulative impact].) ARB‘s response stated the implementation of the proposed ADF
    regulations would mitigate any potentially significant NOx emission impacts resulting
    from increased use of biodiesel associated with the proposed LCFS regulations. Based
    on this mitigation, the response concluded the ―adoption of the proposed LCFS and ADF
    Regulations would not result in a cumulatively considerable contribution to a significant
    adverse [impacts] to long-term air quality.‖ (Underlining omitted.)
    20.
    The public‘s comments and ARB‘s responses to the comments were appended to
    the environmental analysis and were considered by the Board at its hearings in September
    2015.
    4.     ARB’s Return to the Writ
    In November 2015, ARB filed its return to the February 2014 writ together with
    the final Environmental Analysis, ARB‘s responses to comments, and other supporting
    documents. The return explained ARB‘s attempt to comply with paragraph 3 by stating
    ―[t]he Board addressed whether the project (the proposed LCFS and Alternative Diesel
    Fuel (‗ADF‘) regulations) will have a significant adverse effect on the environment as a
    result of increased NOx emission.‖ The return then set forth findings about NOx
    emissions caused by short-term construction projects for new or modified facilities built
    to satisfy the fuel demands incentivized by ARB‘s regulations. The return next addressed
    the emissions caused by using biodiesel, stating ARB found:
    ―[1] that use of biodiesel can increase NOx emissions in some
    engines, depending in part on feedstock and blend level;
    ―[2] that total NOx emissions from biodiesel will decline from the
    2014 baseline level under the proposed LCFS and ADF regulations; and
    ―[3] that the use of biodiesel consistent with the proposed
    regulations will not result in a significant adverse impact to air quality.
    ―(Exhibit C at pp. 4-5, 14; see also Exhibit A at p. 4 [adopting findings].)
    Overall, ARB found that the LCFS and ADF regulations and the
    compliance responses to those regulations would result in long-term
    beneficial impacts to air quality through reductions in criteria pollutants
    (which include NOx emissions). (Exh. C at p. 1.) These findings are
    supported by substantial evidence. (E.g, Exhibit D at p. 30-31, 56-63, 127-
    130 [excerpts of EA]; Exhibit E [ADF ISOR Appendix B].) This satisfies
    paragraph 3 of the peremptory writ.‖
    Plaintiffs objected to ARB‘s return, contending ARB had not complied with
    paragraph 3. Plaintiffs argued ARB had failed to consider the original LCFS regulations,
    which were part of the project. Plaintiffs also challenged ARB‘s use of a 2014 baseline,
    21.
    arguing the later baseline (1) allowed ARB to avoid acknowledging the past (i.e., 2010-
    2015) increases in NOx emissions caused by the original LCFS regulations and (2)
    skewed the analysis of the impact of future NOx emissions by comparing predicted future
    emissions to a baseline made higher by the NOx emissions caused by the original LCFS
    regulations, which became effective in January 2010. Plaintiffs contended ARB‘s
    approach violated paragraph 3 and CEQA by breaking the project into pieces and
    pretending the effect of the first piece (i.e., the original LCFS regulations) was not an
    environmental impact attributable to the project as a whole.
    ARB‘s response contended plaintiffs‘ arguments about the ―project‖ and the
    correct baseline misinterpret paragraph 3. In ARB‘s view, paragraph 3 covered only
    future emissions. Based on this interpretation, ARB contended its adoption of the new
    2015 LCFS regulations and new ADF regulations was a lawful exercise of its
    discretionary authority.
    5.     Trial Court’s Order Discharging the Writ
    On January 5, 2016, the trial court filed an order without holding a hearing. The
    order (1) stated the court had read and considered plaintiffs‘ objections and ARB‘s
    response and (2) found ARB had demonstrated satisfactory compliance with the February
    2014 writ. Based on this finding, the court ordered the writ discharged.
    E.     The Scope of Paragraph 3 and the Meaning of ―Project‖
    1.     Parties’ Interpretations of “Project”
    Plaintiffs contend the term ―project‖ used in paragraph 3 includes the whole of an
    action and, as applied in this case, the whole of the action encompasses both the original
    LCFS regulations and the 2015 LCFS regulations. In contrast, ARB contends ―project‖
    is a reference to the proposed LCFS regulations mentioned in other paragraphs of our
    disposition and the February 2014 writ, which ARB interprets to mean any new LCFS
    regulations that ARB might have considered on remand.
    22.
    2.     Project Means the Whole of an Action
    We used the word ―project‖ in our disposition because of its breadth and its role in
    defining the scope of CEQA. We used ―project‖ in the same sense it is used in CEQA,
    the Guidelines and our many published CEQA decisions.
    CEQA defines ―‗[p]roject‘‖ to mean ―an activity which may cause either a direct
    physical change in the environment, or a reasonably foreseeable indirect physical change
    in the environment, and which is [¶] ... directly undertaken by any public agency.‖ (§
    21065, subd. (a), italics added.) The term ―activity‖ plays on important role in the
    definition of ―project‖—a role reflected in the statement that ―‗―project‖ refers to the
    underlying activity which may be subject to approval‘‖ and not the approval of that
    activity. (California Unions for Reliable Energy v. Mojave Desert Air Quality
    Management Dist. (2009) 
    178 Cal. App. 4th 1225
    , 1238 (CURE); see Guidelines, § 15378,
    subd. (c).)
    The terms ―activity‖ and ―activities‖ appear throughout CEQA and the Guidelines,
    but they are not defined. The Guidelines‘ definition of ―[p]roject,‖ however, substitutes
    the phrase ―the whole of an action‖ for the statutory phrase ―[a]n activity.‖ (Guidelines,
    § 15378, subd. (a).) Thus, courts routinely state the term ―project‖ means the whole of an
    action. (E.g. North Coast Rivers Alliance v. Westlands Water Dist. (2014) 
    227 Cal. App. 4th 832
    , 858; San Joaquin Raptor/Wildlife Rescue Center v. County of
    Stanislaus (1994) 
    27 Cal. App. 4th 713
    , 730.)
    The broad interpretation of ―project‖ to encompass ―the whole of an action‖
    (Guidelines, § 15378, subd. (a)) is designed to provide the fullest possible protection of
    the environment within the reasonable scope of CEQA‘s statutory language. (Tuolumne
    County Citizens for Responsible Growth, Inc. v. City of Sonora (2007) 
    155 Cal. App. 4th 1214
    , 1222 (Tuolumne CCRG); Friends of the Sierra Railroad v. Tuolumne Park &
    Recreation Dist. (2007) 
    147 Cal. App. 4th 643
    , 653 [―CEQA‘s conception of a project is
    broad‖]; Guidelines, § 15003, subd. (f).) This broad interpretation ensures CEQA‘s
    23.
    requirements are not avoided by chopping a proposed activity into bite-sized pieces
    which, when taken individually, may have no significant adverse effect on the
    environment. (Tuolumne 
    CCRG, supra
    , at p. 1223.)
    3.     Projects Involving Legislative Action
    Guidelines section 15378, subdivision (a)(1) provides examples of ―activity
    directly undertaken by any public agency.‖ The examples include building physical
    structures, such as ―public works construction and … improvements to existing public
    structures.‖ (Ibid.) Direct agency ―activity‖ also includes ―enactment and amendment of
    zoning ordinances, and the adoption and amendment of local General Plans.‖ (Ibid.)
    These latter examples support the conclusion that the term ―activity‖ includes a state
    agency‘s enactment of regulations. (See 
    CURE, supra
    , 178 Cal.App.4th at p. 1240 [the
    adoption of a rule or regulation can be a project subject to CEQA]; Plastic Pipe &
    Fittings Assn. v. California Building Standards Com. (2004) 
    124 Cal. App. 4th 1390
    ,
    1412.)
    In Poet I, there was no dispute that the adoption of the original LCFS regulations
    was a ―project‖ for purposes of CEQA. More precisely, the ―activity‖ constituting the
    ―project‖ was ARB‘s action in enacting the regulations plus its actions in implementing
    of the regulations (which includes enforcement activity). The concept of ―activity‖ is not
    central to the parties‘ dispute over what paragraph 3 meant when it used the term
    ―project.‖ Instead, that dispute can be phrased as what constitutes ―the whole of [ARB‘s]
    action.‖ (Guidelines, § 15378, subd. (a).)
    4.     Legal Test for Determining Which Acts Are Part of the Whole
    Answering the question about what constitutes the whole of ARB‘s action
    involves two steps. The first step identifies the legal test for determining the acts or
    activities that constitute the whole CEQA project. The second step applies that test to the
    facts of this case.
    24.
    We discussed the scope of the activity constituting a project in Tuolumne 
    CCRG, supra
    , 155 Cal.App.4th at pages 1222 through 1227, and the appropriate legal test for
    determining which acts to include in, or exclude from, the project. Tuolumne CCRG
    involved physical structures—a proposed road realignment and a proposed Lowe‘s home
    improvement center—that would become part of the physical environment, rather than
    the adoption of an ordinance or regulation. Despite the differences between physical
    construction projects and legislative action, we conclude the same test applies when
    determining what constitutes the whole of the action. In Tuolumne CCRG, the test we
    adopted and applied was whether the acts in question were ―‗related to each other.‘‖
    (Tuolumne 
    CCRG, supra
    , 155 Cal.App.4th at p. 1225, quoting Plan for Arcadia, Inc. v.
    City Council of Arcadia (1974) 
    42 Cal. App. 3d 712
    , 726.)
    We described the reach of this test by stating there are different ways actions can
    be related to (i.e., connected with) each other. (Tuolumne 
    CCRG, supra
    , 155 Cal.App.4th
    at pp. 1226-1227.) For instance, the two actions could be ―related in (1) time, (2)
    physical location and (3) the entity undertaking the action.‖ (Id. at p. 1227.) We also
    examined how closely related the acts were to the overall objective of the project, stating:
    ―The relationship between the particular act and the remainder of the project is
    sufficiently close when the proposed physical act is among the ‗various steps which taken
    together obtain an objective.‘ (Robie et al., Cal. Civil Practice–Environmental Litigation
    (2007) § 8.7.)‖ (Tuolumne 
    CCRG, supra
    , at p. 1226.)15
    In Tuolumne CCRG, the city had conditioned the opening of the home
    improvement center on the completion of the road realignment. (Tuolumne CCRG,
    15     Another way to phrase the question of whether a particular act is a step taken
    towards the achievement of the proponent‘s objective is to ask ―whether the act is part of
    a coordinated endeavor.‖ (Tuolumne 
    CCRG, supra
    , 155 Cal.App.4th at p. 1228, citing
    Association for a Cleaner Environment v. Yosemite Community College Dist. (2004) 
    116 Cal. App. 4th 629
    , 639 [series of acts all part of single, coordinated endeavor] (ACE).)
    
    25. supra
    , 155 Cal.App.4th at p. 1227.) Thus, the realignment was a necessary step to the
    achievement of Lowe‘s objective of opening a new store. Based on ―the various
    connections between the road realignment and the proposed home improvement center,‖
    we concluded they were ―related acts that constitute a single CEQA project.‖ (Ibid.)
    5.     Application of the Test to This Case
    Application of the ―‗related to each other‘‖ test adopted in Tuolumne CCRG to the
    original LCFS regulations, the 2015 LCFS regulations, and the ADF regulations is not
    difficult. They clearly are related to one another and that relationship is extremely close.
    They share the same overall objective of reducing greenhouse gases. They were adopted
    by the same entity, ARB, for the purpose of achieving that objective. The regulations
    cover activity in the same geographical area—California. They address the same subject
    matter—the chemical composition of transportation fuels and the chemical makeup of the
    emissions created by burning those fuels. The temporal connection also is close, as is
    demonstrated by the fact the 2015 LCFS regulations replaced the original LCFS
    regulations, making them sequential.
    Therefore, we conclude that for purposes of CEQA the activities associated with
    the original LCFS regulations, the 2015 LCFS regulations, and the ADF regulations
    constitute a single project. Stated another way, they constitute an ―activity directly
    undertaken by [a] public agency‖ (§ 21065, subd. (a)) and are ―part of a single,
    coordinated endeavor.‖ 
    (ACE, supra
    , 116 Cal.App.4th at p. 639.) It follows that those
    same activities are the ―project‖ referred to in paragraph 3 of the writ.
    6.     Fulfilling the Writ’s Purpose
    As we stated under the heading labeled ―Corrective Action,‖ ―[s]ubdivision (a)(3)
    of section 21168.9 authorizes this court to ‗mandate that the public agency take specific
    action as may be necessary to bring the determination, finding, or decision into
    compliance with [CEQA].‘‖ (Poet 
    I, supra
    , 218 Cal.App.4th at p. 764.) Thus, paragraph
    26.
    3 was the mandate for specific action necessary to bring ARB‘s decision to adopt the
    LCFS regulations into compliance with CEQA. Thus, interpreting the term ―project‖ in
    paragraph 3 to include the original LCFS regulations, the 2015 LCFS regulations, and the
    ADF regulations is necessary to accomplish the purposes of the February 2014 writ.
    A simple way to conceptualize the goal of the writ is to consider the information
    that would have been provided if ARB had complied with CEQA in the first place.
    ARB‘s failure to comply with CEQA meant ARB‘s first set of environmental disclosure
    documents failed to provide all of the information required by CEQA. Paragraph 3
    sought to remedy that informational deficit by directing ARB to provide the missing
    information. From an informational prospective, the ARB‘s remedial actions should
    have placed the public and decision makers in the same positions they would have
    occupied if the first set of environmental disclosure documents had satisfied CEQA.
    CEQAs‘ purpose in requiring an environmental disclosure document is ―to inform
    decision makers and the public of any significant adverse effects a project is likely to
    have on the physical environment.‖ (Neighbors for Smart Rail v. Exposition Metro Line
    Construction Authority (2013) 
    57 Cal. 4th 439
    , 447 (Neighbors for Smart Rail).) The
    benefits of informed decision makers are obvious and need not be described here. The
    benefits of an informed public was explained over 40 years ago by this court:
    ―Only by requiring the [public agency] to fully comply with the letter of the
    law can a subversion of the important public purposes of CEQA be
    avoided, and only by this process will the public be able to determine the
    environmental and economic values of their elected and appointed officials,
    thus allowing for appropriate action come election day should a majority of
    the voters disagree.‖ (People v. County of Kern (1974) 
    39 Cal. App. 3d 830
    ,
    842; Guidelines, § 15003, subd. (e).)
    Here, voters will not be informed of the environmental values of ARB and the
    Board if they are not informed about all of the project‘s impacts, including the impacts of
    the original LCFS regulations. In particular, the public is entitled to know that ARB and
    the Board were willing to accept the risk of higher levels of NOx emissions, with the
    27.
    attendant increase in smog and human health impacts, in exchange for lower overall
    emissions of greenhouse gases to combat global warming. This information, which
    provides insights into ARB‘s environmental values, was omitted from ARB‘s earlier
    environmental disclosure document and this deficiency must be corrected if the purpose
    of CEQA and the February 2014 writ is to be fulfilled.
    Here, ARB has made no realistic attempt to show its narrow interpretation of the
    term ―project‖ serves the purposes of CEQA and the writ. For instance, ARB makes no
    attempt to carefully identify the informational deficit in its earlier environmental
    disclosure document and then show that deficit was put right.
    To summarize, interpreting paragraph 3‘s use of the term ―project‖ to include the
    original LCFS regulations, the 2015 LCFS regulations, and the ADF regulations (1)
    addresses the CEQA defects that paragraph 3 was designed to correct, (2) implements the
    intention of this court, and (3) is how ―project‖ would be interpreted by an objectively
    reasonable attorney familiar with CEQA, the Guidelines, published CEQA decisions
    discussing the term ―project,‖ and the CEQA violation to be remedied.
    F.     Baseline
    1.     Parties’ Contentions
    Plaintiffs contend that the 2014 baseline for NOx emissions adopted by ARB in its
    analysis of the project‘s impact was a ―regulatory sleight of hand [that] conceals the fact
    that California will continue to experience increased NOx emissions caused by the
    original LCFS regulation until at least 2021.‖16 In response, ARB supports its use of the
    16      This argument is based in part on the final Environmental Analysis‘s prediction
    that biodiesel-related NOx emissions in California ultimately will decrease to 2009 levels
    by 2023, which logically implies that NOx emissions from biodiesel in each year before
    2023 will be greater than the NOx emissions from biodiesel in 2009. Thus, plaintiffs‘
    statement about increased NOx emissions is accurate. However, their statement that the
    increases are caused by the original LCFS regulations is not accurate because it goes
    beyond facts and findings in the record. Specifically, ARB has yet to resolve the
    28.
    2014 baselines by noting the absence of any reference in the writ to baseline
    requirements. ARB relies on its interpretation of the term ―project‖ and Guidelines
    section 15125, subdivision (a), which states conditions existing at the time the
    environmental analysis is commenced normally constitute the baseline conditions used to
    determine whether an impact is significant.
    The dispute over the appropriate baseline cannot be resolved without the proper
    application of the term ―project‖ to the facts of this case. When the whole of a project is
    properly identified, then the conditions defining the project‘s baseline can be determined.
    Here, ARB‘s interpretation of ―project‖ was too narrow and, consequently, it chose the
    wrong year as the conditions establishing the baseline for NOx emissions.
    2.     Principles of Law Governing Baseline Selection
    Our Supreme Court has recognized that to achieve CEQA‘s goal of informing
    decision makers and the public of any significant environmental effects a project is likely
    to have, the environmental disclosure document (such as an EIR) ―must delineate
    environmental conditions prevailing absent the project, defining a baseline against which
    predicted effects can be described and quantified.‖ (Neighbors for Smart 
    Rail, supra
    , 57
    Cal.4th at p. 447.) Thus, the concept of a baseline is a key component in identifying and
    quantifying a project‘s environmental effects. CEQA does not use or define the term
    ―baseline,‖ but Guidelines section 15125, subdivision (a) provides in part:
    ―An EIR must include a description of the physical environmental
    conditions in the vicinity of the project, as they exist at the time the notice
    of preparation is published, or if no notice of preparation is published, at
    the time environmental analysis is commenced, from both a local and
    regional perspective. This environmental setting will normally constitute
    the baseline physical conditions by which a lead agency determines
    whether an impact is significant.‖ (Italics added.)
    causation questions and how much of each year‘s increased NOx emissions was or will
    be caused by the project, rather than other factors.
    29.
    In Communities for a Better Environment v. South Coast Air Quality Management
    Dist. (2010) 
    48 Cal. 4th 310
    , the court relied on this provision and case law ―for the
    principle that the baseline for an agency‘s primary environmental analysis under CEQA
    must ordinarily be the actually existing physical conditions rather than hypothetical
    conditions that could have existed under applicable permits and regulations.‖ (Neighbors
    for Smart 
    Rail, supra
    , 57 Cal.4th at p. 448, citing Communities for a Better 
    Environment, supra
    , at pp. 320-322.) The court addressed the problem of defining an existing
    conditions baseline in circumstances where the existing conditions themselves change or
    fluctuate over time. (Communities for a Better 
    Environment, supra
    , at pp. 327-328.) The
    court resolved this problem by concluding a single, uniform rule for determining existing
    conditions was not appropriate. (Id. at p. 328.) Instead, the court interpreted CEQA and
    the Guidelines as giving the agency ―the discretion to decide, in the first instance, exactly
    how the existing physical conditions without the project can most realistically be
    measured.‖ (Ibid.) Thus, the court held the agency‘s discretion ―relate[s] to the choice of
    a measurement technique for existing conditions, not the choice between an existing
    conditions baseline and one employing solely conditions projected to prevail in the
    distant future.‖ (Neighbors for Smart 
    Rail, supra
    , at p. 449, describing Communities for
    a Better Environment.)
    Neighbors for Smart 
    Rail, supra
    , 
    57 Cal. 4th 439
    , is more pertinent to the baseline
    issues raised in this appeal. In that case, the Supreme Court extended its discussion of
    baselines to following question: ―Is it ever appropriate for an EIR‘s significant impacts
    analysis to use conditions predicted to prevail in the more distant future, well beyond the
    date the project is expected to begin operation, to the exclusion of an existing conditions
    baseline?‖ (Id. at p. 453.) The court first concluded agencies had such discretion,
    observing that the norm was an existing conditions baseline and a departure from the
    norm is permitted if it ―promotes public participation and more informed decisionmaking
    by providing a more accurate picture of a proposed project‘s likely impacts.‖ (Ibid.) The
    30.
    court next concluded that when an agency chooses to forgo the existing conditions
    analysis and evaluate only the impacts on future conditions, it must provide a justification
    for that choice. (Id. at p. 454.)
    In summary, the Guidelines and foregoing cases set forth two main principles
    relevant to this appeal. First, an existing conditions baseline is ordinarily used in
    analyzing a project‘s environmental impacts. Second, a lead agency has the discretion to
    choose to evaluate the impacts on future conditions, so long as it provides an adequate
    justification for omitting an existing conditions analysis. These principles serve CEQA‘s
    informational purpose by insisting the ―CEQA analysis employ a realistic baseline that
    will give the public and decision makers the most accurate picture practically possible of
    the project‘s likely impacts.‖ (Neighbors for Smart 
    Rail, supra
    , 57 Cal.4th at p. 449.)
    3.      Application of Principles
    The project in this case includes the original LCFS regulations. Thus, the normal
    baseline would be the physical conditions existing at the time the environmental analysis
    of the original LCFS regulations commenced. (Guidelines, § 15125, subd. (a); Neighbors
    for Smart 
    Rail, supra
    , 57 Cal.4th at p. 455 [―Guidelines establish the default of an
    existing conditions baseline‖].) Exactly when ARB‘s environmental analysis
    commenced is not clear from the record. It probably occurred after January 2007, when
    Governor Schwarzenegger directed ARB to determine if a LCFS could be adopted as a
    discrete early action under the California Global Warming Solutions Act of 2006. (Poet
    
    I, supra
    , 218 Cal.App.4th at p. 700.) It might have commenced in ―August 2007[ when]
    ARB began consulting with the public about a LCFS.‖ (Id. at p. 701.) Thus, the normal,
    existing conditions baseline for NOx emissions might have described conditions existing
    in August 2007 or, if a full calendar year was used to define the baseline conditions, the
    NOx emissions from calendar year 2006.
    31.
    ARB used a 2014 baseline and thought such a baseline described existing
    conditions because ARB misconstrued and misapplied the term ―project.‖ The adoption
    of the original LCFS regulations predates 2014 by several years and, therefore, the 2014
    baseline does not describe the conditions existing when the environmental analysis of the
    project commenced. Nevertheless, ARB‘s use of a 2014 baseline contrary to the norm
    established by Guidelines section 15125 might be allowed under the exception to that
    section‘s general requirement that an existing conditions baseline be used. In view of this
    possibility, we consider whether ARB‘s choice of a 2014 baseline fits within that
    exception. An agency that deviates from the norm must provide an adequate justification
    for omitting an existing conditions analysis. (Neighbors for Smart 
    Rail, supra
    , 57 Cal.4th
    at p. 454.) ARB could have justified its use of a 2014 baseline by demonstrating an
    existing conditions ―analysis would [have been] uninformative or misleading to decision
    makers and the public.‖ (Id. at p. 453.) Restated from the opposite perspective, ARB
    could have shown the 2014 baseline ―promote[d] public participation and more informed
    decisionmaking by providing a more accurate picture of a proposed project‘s likely
    impacts.‖ (Ibid.)
    ARB attempted to justify the use of a 2014 baseline in the paragraph of the final
    Environmental Analysis that began: ―In the interest of public disclosure, ARB staff
    examined the current and expected future emissions of NOx from biodiesel relative to the
    NOx emissions from biodiesel that were occurring prior to the adoption of the original
    LCFS (2009).‖ The final Environmental Analysis proceeded to make three main points.
    First, it stated that ―[i]n 2009, … the NOx emissions from biodiesel were minimal.‖
    Second, it stated that ―since 2009, NOx emissions from biodiesel have increased with the
    increased use of biodiesel‖ and attributed the increased biodiesel use to ―multiple
    incentives.‖ This statement identifies the difficulty of determining causation—that is,
    apportioning the increased use of biodiesel among the factors causing the increase.
    Third, the final Environmental Analysis stated ―it is unclear and impossible to determine
    32.
    what portion of the increase in use is attributable to the original LCFS.‖ The final
    Environmental Analysis then discussed the federal regulations promoting biodiesel use.
    ARB‘s defense of the 2014 baseline also included its response to a comment
    asserting the 2014 baseline was inappropriate. ARB stated it did not agree that an earlier
    ―baseline would yield meaningful information for environmental analysis.‖
    As described below, we conclude ARB has not demonstrated its ―CEQA analysis
    employ[ed] a realistic baseline that [gave] the public and decision makers the most
    accurate picture practically possible of the project‘s likely impacts.‖ (Neighbors for
    Smart 
    Rail, supra
    , 57 Cal.4th at p. 449.) First, the assertion that NOx emissions from
    biodiesel in 2009 were minimal suggests a 2009 baseline would have been small, a fact
    that does not make its use uninformative or misleading. Second, the difficulty in sorting
    out causation among various factors does not justify ARB‘s avoidance of the question for
    the period preceding the effective date of the 2015 LCFS regulations. ARB, as the lead
    agency performing the environmental analysis, sits as the trier of fact and we are aware of
    no rule of law that allows an agency to escape that responsibility simply because the
    factual question is difficult. (See Madera Oversight Coalition, Inc. v. County of Madera
    (2011) 
    199 Cal. App. 4th 48
    , 102, fn. 31 [public agency acts as the trier of fact].)
    Moreover, ARB is not expected to provide an exact or perfect answer. (Guidelines, §
    15151 [perfection in evaluation of environmental effects is not required].) ARB‘s
    environmental analysis of this project has demonstrated it can make projections and
    estimates. Therefore, we conclude ARB can resolve the factual questions of causation
    based on estimates that are supported by substantial evidence. (Guidelines, §§ 15144
    [forecasting], 15384 [substantial evidence].)
    As to the final Environmental Analysis‘s statement that it would be ―impossible‖
    to apportion increases among the original LCFS regulations and other factors, counsel for
    ARB stated during oral argument that ARB was willing and able to decide the issues
    relating to causation. Thus, ARB has conceded such findings are not ―impossible.‖
    33.
    Similarly, ARB‘s conclusory statement that use of a baseline earlier than 2014 would not
    yield meaningful information is unpersuasive, because it based on ARB‘s supposed
    inability to make findings of fact about the causes of increased biodiesel use.
    Therefore, we conclude ARB failed to justify its use of a 2014 baseline for the
    project‘s NOx emissions and, as a result, ARB failed to comply with CEQA and
    paragraph 3. When this court decided to allow the original LCFS regulations to remain
    operative pending ARB‘s compliance with CEQA, we did not intend to deprive the
    public or decision makers of information about increased NOx emissions caused by the
    original LCFS regulations during that compliance period. A proper baseline would
    identify the conditions that existed before any impacts of the original LCFS regulations
    began to accrue and, thus, would provide a solid foundation for identifying those impacts.
    (See pt. II.G, post [baseline on remand].)
    G.     Meaning of the Phrase ―Will Have‖
    The last question about the proper interpretation of paragraph 3 involves the
    command that ARB ―[a]ddress whether the project will have a significant adverse effect
    on the environment as a result of increased NOx emissions .…‖ (Italics added.) ARB
    points to the phrase ―project will have‖ in paragraph 3 and argues it refers to effects of
    the 2015 LCFS regulations ―that might occur from those new regulations in the future.‖
    (Underlining changed to italics.) ARB‘s interpretation is based in large part on its
    incorrect view that ―project‖ referred only to the 2015 LCFS regulations and excluded the
    original LCFS regulations. Nonetheless, ARB‘s view that paragraph 3 was concerned
    with future effects only is based in part on the verb phrase ―will have.‖
    Part of the background for the wording of paragraph 3 is provided in the section of
    our opinion addressing the CEQA violation relating to NOx emissions. In that section,
    we stated: ―On remand, ARB may not simply assume that the LCFS regulations will not
    have a significant adverse impact on the environment. ARB must make a finding of fact,
    34.
    supported by substantial evidence, on the question whether the project will have a
    significant adverse effect on the environment as a result of the potential increase in NOx
    emissions.‖ (Poet 
    I, supra
    , 218 Cal.App.4th at p. 740.) We used the phrase ―will have‖
    instead of the phrase ―may cause‖ appearing in the definition of ―project‖ (§ 21065) for
    two reasons. The first was an attempt to reduce the chances that ARB would continue its
    avoidance of the issue (as it did with its assumption) by making alternative findings that
    the project might or might not cause increased NOx emissions. The second was that the
    phrases ―may cause‖ or ―may have‖ are more appropriate for the inquiry conducted at the
    initial-study stage of review when a lead agency applies the fair argument standard to
    determine whether the project may cause or may have a significant environmental impact
    and, thus, requires the preparation of an EIR to complete a full environmental review of
    that impact. (See § 21080, subd. (d) [if ―project may have a significant effect on the
    environment, an [EIR] shall be prepared‖]; Guidelines, §§ 15063, 15365.)
    As to the meaning of the phrase ―will have,‖ we note the verb ―will‖ has many
    definitions and there are differences within those definitions as to timing. For instance,
    ―will‖ can be ―used to express simple futurity‖ or ―used to express simple action or
    intention without conscious reference to future time.‖ (Webster‘s 3d New Internat. Dict.
    (1993) p. 2616, col. 3.) Also, ―will‖ can be ―used to express capability.‖ (Ibid.) Here,
    the disposition in Poet I used ―will have‖ to refer to the project‘s capability of causing
    adverse environmental effects due to increased NOx emissions. We intended ARB to
    address this capability for the project as a whole (i.e., original and modified regulations)
    and ―make findings (supported by substantial evidence) regarding the potential adverse
    environmental effect of increased NOx emissions, and adopt mitigation measures in the
    event the environmental effects are found to be significant.‖ (Poet 
    I, supra
    , 218
    Cal.App.4th at p. 767.)
    In any event, the ambiguity in the phrase ―will have‖ need not be discussed at
    length because ARB did not comply with paragraph 3, regardless of whether ―will have‖
    35.
    is interpreted as referring (1) to the future only or (2) to the capability to cause
    environmental effects, past and future. Under either interpretation of paragraph 3, ARB
    did not comply with the writ because ARB wrongly construed ―project‖ and, in turn,
    failed to adopt a proper baseline. As explained below, these errors meant ARB‘s analysis
    of the NOx emissions understated the amount of those emissions potentially attributable
    to the LCFS regulations.17
    If one assumes (as contended by ARB) that paragraph 3 was concerned only with
    future impacts, the relevant impacts are those occurring after the 2015 LCFS regulations
    went into effect on January 1, 2016. ARB has chosen to discuss impacts on a year-by-
    year basis, a convention that we will use in this discussion. Thus, in 2015, ARB should
    have addressed NOx impacts in each year from 2016 through at least 2021. That
    analysis, described in broad terms, includes the following three steps.
    First, ARB should have predicted the amount of NOx emissions for each year and
    subtracted the baseline NOx emissions from that amount. Subtracting the baseline figure
    would have yielded the total increase in NOx emissions for each year. Second, ARB
    should have made findings of fact about causation and allocated the increase among the
    factors causing the increase, which might have included the 2015 LCFS regulations.
    Third, ARB should have determined whether the amount of any increase caused by the
    LCFS regulations was ―significant‖ as that term is used in CEQA. (See fn. 8, ante.)
    ARB‘s use of the wrong baseline skewed the calculation performed in the first
    step. The resulting error was so large that ARB did not reach the second and third steps
    of the analysis. More specifically, NOx emissions from the combination of biodiesel and
    renewable diesel increased between 2009 and 2014. Use of 2014 as the baseline of NOx
    emissions included this increase and, thus, overstated the baseline figure. The inflated
    17      The term ―potentially‖ is used because the entire increase may not be caused
    solely by the project. The factual questions relating to causation are discussed in part
    I.F.3, ante.
    36.
    baseline had the effect of understating the increase in NOx emissions for 2016 and
    subsequent years. Consequently, ARB‘s use of an inappropriate baseline as the point of
    comparison for the project‘s NOx emissions requires reversal even if paragraph 3 were
    interpreted as (1) directing ARB to address only future (i.e., 2016 through 2021) NOx
    emissions and their causes and (2) allowing it to skip over the potential impacts from
    2009 through 2015. In sum, ARB‘s analysis of NOx emissions was defective even if it is
    given the benefit of the ambiguity in paragraph 3‘s use of the phrase ―will have.‖
    H.     Prejudice
    The last element plaintiffs must establish to obtain a reversal is prejudice.
    Accordingly, we consider whether ARB‘s failure to comply with the writ and CEQA was
    prejudicial. A starting point for this inquiry is the proposition that employing an
    incorrect baseline is not necessarily prejudicial. For example, in Neighbors for Smart
    
    Rail, supra
    , 
    57 Cal. 4th 439
    , the Supreme Court determined the use of a wrong baseline
    for analyzing traffic was ―an insubstantial, technical error that cannot be considered
    prejudicial.‖ (Id. at p. 463.)
    In this case, we conclude that ARB‘s failure to comply with paragraph 3 resulted
    in its environmental disclosure documents omitting information (1) required by CEQA
    and (2) necessary to an informed discussion. (Citizens Opposing a Dangerous
    Environment v. County of Kern (2014) 
    228 Cal. App. 4th 360
    , 382 [test for prejudice].) At
    least two gaps in information occurred. First, ARB‘s disclosure did not analyze the
    increase in NOx emissions for the period from 2009 through the readoption of the
    regulations. Information about NOx emissions from this period was necessary to inform
    the public and decision makers. Second, the discussion of the NOx emissions forecast to
    occur after the adoption of the 2015 LCFS regulations was inaccurate because the wrong
    baseline was used and, as a result, the discussion misleadingly understated the increase in
    NOx emissions for 2016 and the years following. This understatement allowed ARB to
    37.
    conclude NOx emissions would decrease and to avoid (1) making findings of fact
    allocating the increased emissions among the various causes and (2) determining whether
    the amount of the increased emissions caused by the project was significant. These gaps
    in information are at the heart of the analysis used to determine whether a project is likely
    to have a significant adverse environmental impact and, thus, cannot be regarded as
    insubstantial, technical errors. Consequently, we conclude plaintiffs have shown the
    failure to comply with paragraph 3 was prejudicial to CEQA‘s informational goals.
    II.    REMEDY
    ARB‘s prejudicial failure to comply with paragraph 3 is more than a failure by a
    public agency to fulfill the terms of a writ of mandate. The February 2014 writ was
    issued to remedy violations of CEQA. Thus, ARB‘s failure to comply with paragraph 3
    also constitutes a violation of CEQA. In other words, since 2009, ARB has been in
    violation of CEQA because its environmental disclosure documents have not provided
    the public and decision makers with statutorily required information about the project‘s
    NOx emissions. As a result, ARB‘s corrective action taken in reliance on those
    environmental disclosure documents did not comply with CEQA.
    Accordingly, the appellate relief granted in this case is shaped by the fact that
    ARB‘s actions failed to comply with the writ and violated CEQA. The relief granted
    must remedy the dual nature of ARB‘s wrong. Our discussion of the appropriate remedy
    begins with the general principles governing the judicial relief available for a failure to
    comply with the terms of a writ of mandate and then addresses CEQA‘s influence on the
    relief available.
    A.      Failure to Comply with the Writ
    1.    Basic Principles
    No statute specifically defines the appellate relief available when a trial court
    erroneously discharges a writ of mandate. Code of Civil Procedure section 906 sets forth
    38.
    the general authority of appellate courts to provide relief. Consequently, that section
    provides the statutory foundation for the appellate relief available in cases of erroneously
    discharged writs. Code of Civil Procedure section 906 states that an appellate court
    reviewing an appealable order ―may affirm, reverse or modify‖ the order. The appellate
    court also ―may direct the proper … order to be entered, and may, if necessary or proper,
    direct … further proceedings to be had.‖ (Code Civ. Proc., § 906.) The express statutory
    authority to direct further proceedings that are necessary and proper fits with an appellate
    court‘s ―inherent power to decide any issue deemed necessary for a proper disposition of
    the case.‖ (Canal-Randolph Anaheim, Inc. v. Wilkoski (1978) 
    78 Cal. App. 3d 477
    , 495.)
    Reported decisions provide few examples of relief granted after an appellate court
    determines an order discharging a writ of mandate was granted in error. The first and
    obvious type of relief is the reversal of the trial court‘s order discharging the writ. (See
    Sanders v. City of Los Angeles (1970) 
    3 Cal. 3d 252
    , 261-262 [Court of Appeal‘s reversal
    of order discharging the writ affirmed] (Sanders); Lewis v. Steifel (1950) 
    98 Cal. App. 2d 648
    , 652 [―order discharging and vacating writ is reversed‖].) In addition, the appellate
    court may expand upon the reversal by directing the trial court to order defendants to
    comply with the writ. 
    (Sanders, supra
    , at p. 256; see Sanders v. City of Los Angeles
    (1967) 
    252 Cal. App. 2d 488
    , 495 [―the court is directed to order all defendants to comply
    with the writ of mandate‖].) The appellate court also may direct the trial court to issue
    ―‗any further appropriate orders to compel obedience to the writ.‘‖ 
    (Sanders, supra
    , at p.
    262.)
    To summarize, when an appellate court determines a public official or agency has
    failed to comply with a writ of mandate, the basic components of appellate relief are (1)
    reversal of the order discharging the writ and (2) instructions to the trial court to issue (a)
    an order directing the public official or agency to comply with the writ and (b) any
    further appropriate orders to compel obedience to the writ.
    39.
    2.     Determining What Further Orders are Appropriate
    The principle that a court may issue ―‗further appropriate orders to compel
    obedience to the writ‘‖ 
    (Sanders, supra
    , 3 Cal.3d at p. 262) gives rise to the question of
    how a court determines what is appropriate in a particular case. We have located, and
    the parties have cited, no case law explicitly addressing this question in a CEQA case.
    We conclude that, where a CEQA violation was addressed by the underlying writ of
    mandate, the determination of what further orders are appropriate to compel obedience
    with the writ is controlled and guided by CEQA‘s requirements, principles and policies.
    Consequently, a further order generally will be deemed appropriate if (1) the required
    action is among the types of relief permitted by CEQA and (2) it promotes the goal of
    compliance with CEQA, which is why the writ was issued in the first place. Restated in
    the negative, a further order is not appropriate in a CEQA proceeding if (1) the order
    contradicts express limitations on relief set forth in section 21168.9 or (2) the order is
    inconsistent with the purposes of CEQA.
    3.     Discretionary Authority under CEQA to Fashion a Remedy
    The role of CEQA in guiding the determination of what further orders are
    appropriate in this appeal returns us to Poet I‘s discussion of the provisions that may be
    included in a peremptory writ of mandate issued to remedy CEQA violations. (Poet 
    I, supra
    , 218 Cal.App.4th at pp. 756-766.) We stated section 21168.9 provides that the writ
    may direct the agency ―(1) to void, in whole or in part, a determination, finding or
    decision, (2) to ‗suspend any or all specific project activity or activities‘ if certain
    conditions exist, or (3) to take specific action necessary to bring the determination,
    finding or decision tainted by the CEQA violation into compliance with CEQA.‖ (Poet 
    I, supra
    , at p. 757, fn. omitted; see § 21168.9, subd. (a)(1)-(3).) We concluded these
    categories of relief remain relevant to deciding what further orders may be appropriate in
    this appeal.
    40.
    Also, section 21168.9 supplements its affirmative statement of available relief
    with provisions explicitly limiting the remedial action that courts may include in the writ
    of mandate. (Poet 
    I, supra
    , 218 Cal.App.4th at p. 758; see § 21168.9, subds. (b)-(c).)
    Those express statutory limitations are not set forth here because our discussion of those
    limitations already is published in Poet 
    I, supra
    , at page 758 and severance is discussed
    in part II.F, post. As to specific implied limitations, none exist because subdivision (c) of
    section 21168.9 states: ―Except as expressly provided in this section, nothing in this
    section is intended to limit the equitable powers of the court.‖ (Poet 
    I, supra
    , 218
    Cal.App.4th at p. 758.)
    Therefore, we conclude our authority to grant appellate relief in this case is
    derived from (1) the general provisions in Code of Civil Procedure section 906 and (2)
    CEQA‘s provisions governing remedies.
    B.      ARB‘s Claims of Unavailable Appellate Relief
    ARB has not identified the statutory basis for this court‘s power to grant appellate
    relief, yet ARB contends our jurisdiction in this appeal is limited. Specifically, ARB
    claims the appellate relief available in this case cannot attempt to remedy errors in the
    way ARB adopted the 2015 LCFS regulations because ―the court with jurisdiction over
    those questions is the superior court handling [plaintiffs‘] direct challenge to the new
    regulation.‖
    ARB also addresses the possibility that this court might enter relief affecting the
    2015 LCFS regulations under the theory that the relief is preliminary in nature. ARB
    contends plaintiffs have not shown the requisite elements for preliminary relief—namely,
    the likelihood of success on the merits and irreparable injury absent relief.
    We reject ARB‘s argument that we lack the jurisdiction or authority to suspend the
    2015 LCFS regulations. First, ARB has cited no statutory authority for such a
    jurisdictional limitation on the general authority granted by Code of Civil Procedure
    41.
    section 906. Second, ARB has cited no case law recognizing such a limitation on the
    authority of an appellate court. Third, this court has not limited or surrendered the
    authority to remedy failures to comply with the February 2014 writ or enforce our
    disposition in Poet I. For instance, Poet I contains no provision surrendering or
    otherwise limiting our authority in subsequent appeals. Therefore, we conclude the
    analysis set forth in part II.A, ante defines our authority to enter relief in this appeal,
    which is limited to ARB‘s failure to comply with the writ and the related violation of
    CEQA pertaining to NOx emissions.18
    As to ARB‘s specific argument about our lack of authority to suspend the 2015
    LCFS regulations, we note that ARB adopted the 2015 LCFS regulations as part of its
    attempt to comply with paragraph 3 of the February 2014 writ. That attempt did not
    comply and, as a result, the initial violation of CEQA remains uncorrected and taints the
    2015 enactment. To remedy the continuing CEQA violation, we conclude the further
    appropriate orders in this case might include suspending the 2015 LCFS regulations
    because suspension is a type of relief expressly authorized by subdivision (a)(2) of
    section 21168.9. In other words, suspension of the 2015 LCFS regulations might be a
    ―necessary or proper‖ order under Code of Civil Procedure section 906.
    To the extent ARB‘s argument implies plaintiffs‘ current request for suspension of
    the 2015 LCFS regulations is an improper collateral attack on the regulations, we
    disagree. The challenges raised by plaintiffs in this appeal are limited to issues
    previously raised in Poet I and dealt with by the February 2014 writ. Thus, the
    challenges considered in this appeal are not collateral in nature. The directness of the
    18     In other words, we are not asserting any authority (i.e., jurisdiction) to remedy
    CEQA violations alleged in another lawsuit, only the authority to remedy a CEQA
    violation that has been a part of this lawsuit since the complaint was filed in December
    2009.
    42.
    challenges is illustrated by, among other things, their satisfaction of the issue exhaustion
    requirement set forth in section 21177, subdivision (b) throughout this litigation.
    C.     Reversal with a Generic Order to Comply with the Writ
    Here, the parties impliedly accept the conclusion that the order discharging the
    writ should be reversed if the order was granted in error. Such a reversal would require
    further proceedings on remand so ARB could comply with the writ and obtain an order
    discharging the writ. Consequently, we consider whether our disposition should simply
    (1) reverse the order discharging the writ and (2) instruct the trial court to issue a generic
    order directing ARB to comply with the writ.
    This theoretically possible disposition would have the effect of reinstating all
    provisions of the writ. Reinstatement, however, would give rise to disputes between the
    parties over how the writ‘s provisions should be applied to the further proceedings. The
    potential disputes described below demonstrate (1) a simple reversal with directions for
    ARB to comply with the writ is not appropriate and (2) further orders are needed to
    clarify matters.
    1.     Paragraph 6 and the Status Quo
    Reinstating the February 2014 writ would reinstate paragraph 6, which stated ARB
    shall continue ―to adhere to the LCFS regulations standards in effect for 2013 until the
    corrective action is completed.‖ (Poet 
    I, supra
    , 218 Cal.App.4th at p. 767.) Paragraph
    6‘s purpose was to preserve the status quo until ARB had complied with the writ and
    remedied its CEQA violations. (Ibid.) The parties‘ appellate briefing shows they do not
    agree on paragraph 6‘s continuing role, if any, after remand.
    The parties have adopted different interpretations of paragraph 6‘s phrase ―until
    the corrective action is completed.‖ ARB has interpreted ―is completed‖ to refer to the
    point where it finished the administrative steps in its environmental review and
    reapproval process. This agency-centric interpretation differs from our court-centric
    43.
    intent. We intended ARB‘s corrective action to be regarded as ―completed‖ when that
    corrective action was approved by the trial court after ARB filed its return to the writ.
    Under our view of when ARB‘s corrective action would have been completed, a
    reversal of the discharge order would mean that ARB‘s corrective action would not be
    regarded as ―completed‖ for purposes of paragraph 6. Thus, paragraph 6 would continue
    to require ARB ―to adhere to the LCFS regulations standards in effect for 2013.‖ (Poet 
    I, supra
    , 218 Cal.App.4th at p. 767.) In contrast, under ARB‘s interpretation, its corrective
    action was completed no matter what happened subsequently in court and, thus,
    reinstating the writ would not revive paragraph 6 or the 2013 standards. Under ARB‘s
    view, the applicable fuel standards on remand would be determined by the 2015 LCFS
    regulations because that version of the regulations is currently in effect.
    These differing interpretations have had no effect on how this case has proceeded
    so far. However, these conflicting interpretations could generate uncertainty in
    subsequent proceedings if further orders do not clarify paragraph 6‘s role on remand.
    2.     Paragraphs 6 and 11: Suspending the 2013 Standards
    Assuming the parties agreed with our interpretation of the phrase ―is completed‖
    and agreed paragraph 6 of the February 2014 writ would be reinstated on remand, a
    dispute would arise involving the last clause of paragraph 6. That clause states that ―the
    LCFS regulations shall remain in operation and shall be enforceable unless its operation
    is suspended as provided below.‖ (Poet 
    I, supra
    , 218 Cal.App.4th at p. 767, italics
    added.) The phrase ―as provided below‖ refers to a provision in Poet I‘s disposition that
    became paragraph 11 of the February 2014 writ. Paragraph 11 states in full:
    ―ARB shall proceed in good faith without delay. In the event ARB fails to
    proceed in good faith with diligence, this [trial] Court immediately shall
    vacate Paragraph 6 of this writ, which preserves the status quo and shall
    direct ARB to set aside the LCFS regulations (i.e., suspend the operation
    and enforcement of the regulations).‖
    44.
    Plaintiffs contend ARB did not act in good faith and, therefore, whatever version
    of the LCFS regulations ARB believes would be in effect on remand should be suspended
    until ARB actually has complied with paragraph 3. In response, ARB argues it acted in
    good faith and, moreover, interprets paragraphs 6 and 11 in a manner that gives them no
    ongoing effect, thus rendering them irrelevant to any proceedings on remand. These
    arguments demonstrate that additional uncertainty would arise on remand if further
    orders do not resolve the parties‘ disputes involving paragraphs 6 and 11 of the February
    2014 writ.
    D.       Who Determines the Content of the Further Appropriate Orders
    The need for ―further appropriate orders‖ raises the question of which court should
    determine the content of those orders—this court or the trial court? There are three
    possible answers. First, we could remand to the trial court with generic directions for that
    court ―to order defendants to comply with the writ and to make any further appropriate
    orders to compel obedience thereto.‖ 
    (Sanders, supra
    , 3 Cal.3d at p. 256.) Second, we
    could draft the further appropriate orders ourselves and direct the trial court to issue those
    orders on remand. Third, we could divide the drafting responsibility, addressing some of
    the issues in our disposition and directing the trial court to draft provisions addressing
    other issues.
    The choice among these three possibilities lies within the discretionary authority
    of the appellate court. Code of Civil Procedure section 906 provides that an appellate
    court ―may direct the proper … order to be entered, and may, if necessary or proper,
    direct … further proceedings to be had.‖ We interpret the statute‘s use of ―may‖ as
    signaling the grant of discretionary authority. (Wells Fargo Bank, N.A. v. 6354 Figarden
    General Partnership (2015) 
    238 Cal. App. 4th 370
    , 384 [generally, a statute using ―may‖
    grants discretion].)
    45.
    In this case, we choose to exercise our discretionary authority by preparing the
    terms of the order to be issued on remand. Our choice is based on the fact that this court
    (1) identified the original CEQA violations, (2) drafted the terms of the February 2014
    writ designed to remedy those violations, (3) identified ARB‘s failure to comply with
    paragraph 3, and (4) is familiar with the purpose of paragraph 3 and the CEQA policies it
    sought to promote. Also, the present case is a CEQA proceeding and, consequently, this
    court occupies nearly the same position as the trial court —that is, each court sits as a
    court of review considering the agency‘s action. 
    (Vineyard, supra
    , 40 Cal.4th at p. 427.)
    This similarity of position, coupled with the trial court‘s workload, supports our decision
    to prepare the terms of the order issued on remand.
    E.     Reinstate the 2013 Standards?
    The further orders we direct to be issued on remand should clarify whether the
    2013 standards contained in the original LCFS regulations are reinstated and will be the
    operative standards pending discharge of the writ. (See pt. II.C, ante.) We conclude
    2013 standards should not be reinstated and the February 2014 writ should be modified to
    prevent such a reinstatement.
    We conclude that reinstating the 2013 standards would not fulfill the original
    purpose of paragraph 6—preservation of the status quo. Poet I was filed in July 2013
    when the 2013 standards applied to persons subject to the LCFS regulation. Since then,
    circumstances have changed. On January 1, 2016, the 2015 LCFS regulations and the
    standards set forth in those regulations went into effect. During 2016, persons subject to
    the 2015 LCFS regulations filed their quarterly reports using the standards contained in
    the 2015 LCFS regulations. (See Cal. Code Regs., tit. 17, § 95491, subd. (a) [reporting
    requirements].) They also will use those standards when they will file their annual
    compliance report for 2016, which is due by April 30, 2017. (Id., subd. (a)(1)(B).) As a
    result, returning to the 2013 standards would be disruptive.
    46.
    Therefore, we conclude the 2013 standards should not be reinstated. The further
    orders contained in our disposition will modify the terms of the February 2014 writ to
    implement this conclusion about the 2013 standards.
    F.     Voiding and Suspending?
    If the 2013 standards are not reinstated, should we adopt plaintiffs‘ position and
    suspend operation of the regulations or, alternatively, should we adopt ARB‘s position
    and allow the 2015 LCFS regulations and ADF regulations to remain in effect? As the
    2015 LCFS regulations and ADF regulations currently are in effect, the question is
    whether to invalidate (i.e., suspend) those regulations in whole or in part.
    1.     Basic Principles
    Section 21168.9 states that a writ of mandate addressing a failure to comply with
    CEQA may direct ―the determination, finding, or decision be voided by the public
    agency, in whole or in part‖ and, when certain conditions exist, may direct the public
    agency and real parties in interest to ―suspend any or all specific project activity or
    activities.‖ (§ 21168.9, subd. (a)(1)-(2).) The phrases ―in whole or in part‖ and ―any or
    all‖ raise the possibility of severing some part of the approvals and the project from other
    parts and then invalidating or suspending only the severed parts. Indeed, CEQA makes
    the consideration of severance mandatory by stating: ―Any order pursuant to subdivision
    (a) shall include only those mandates which are necessary to achieve compliance with
    [CEQA] and only those specific project activities in noncompliance with [CEQA].‖ (§
    21168.9, subd. (b); see § 15 [shall is mandatory].) However, a suspension limited to
    noncompliant project activities is allowed ―only if a court finds that (1) the portion or
    specific project activity or activities are severable, (2) severance will not prejudice
    complete and full compliance with [CEQA], and (3) the court has not found the
    remainder of the project to be in noncompliance with [CEQA].‖ (§ 21168.9, subd. (b).)
    47.
    2.      Principles Governing Severance
    The statute directs courts to consider whether ―the portion or specific project
    activity or activities are severable‖ (§ 21168.9, subd. (b)), but does not set forth a test for
    severability. Consequently, we turn to the analysis of severability adopted by our
    Supreme Court.
    The first step of that analysis is to look for any severability clauses in the
    enactment. (California Redevelopment Assn. v. Matosantos (2011) 
    53 Cal. 4th 231
    , 270
    (Matosantos).) ARB included severability clauses in the ADF regulations and the 2015
    LCFS regulations. (Cal. Code of Regs., tit. 13, § 2293.9 [ADF regulations]; 
    Id., tit. 17,
    §
    95497 [2015 LCFS regulations].) These clauses establish a presumption in favor of
    severance, but are not conclusive. 
    (Matosantos, supra
    , at p. 270; Verner, Hilby and Dunn
    v. City of Monte Sereno (1966) 
    245 Cal. App. 2d 29
    , 35 [invalid licensing requirements in
    ordinance materially affected remainder of regulatory scheme; entire ordinance held void
    despite severability clause].)
    Determining whether the presumption holds or is negated involves an evaluation
    of the three judicially prescribed ―criteria for severability: the invalid provision must be
    grammatically, functionally, and volitionally separable.‖ (Calfarm Ins. Co. v.
    Deukmejian (1989) 
    48 Cal. 3d 805
    , 821.) Grammatical (i.e., mechanical) separability
    exist when the invalid parts can be removed as a whole without affecting the wording or
    coherence of the remaining parts. 
    (Matosantos, supra
    , 53 Cal.4th at p. 271.) Functional
    separability addresses how the enactment would operate without the invalid provision
    and is present when severance does not destroy the regulatory scheme or the utility of the
    remainder. 
    (Calfarm, supra
    , at p. 822; Blumenthal v. Board of Medical Examiners
    (1962) 
    57 Cal. 2d 228
    , 238.) In other words, functional separability depends on whether
    the remainder of the enactment is complete in itself and can be implemented without the
    continuation of the invalid provision. 
    (Matosantos, supra
    , at p. 271.) Volitional
    48.
    separability exists when the legislative body would have adopted the remainder had it
    foreseen the partial invalidation of the enactment. (Ibid.)
    3.     The ADF Regulations Will Remain in Effect
    The parties agree that the ADF regulations and the 2015 LCFS regulations can be
    severed from one another. Our own analysis leads us to conclude that the ADF
    regulations meet the all the requirements for severance set forth in section 21168.9,
    subdivision (b). Based on that analysis (which confirms the position taken by the
    parties), we need not discuss the severability of the ADF regulations in detail.
    Furthermore, our conclusion that the ADF regulations were not tainted by the continuing
    CEQA violation leads us to conclude that the ADF regulations shall remain in effect on
    remand. Accordingly, the relief granted in this appeal will allow the ADF regulations to
    continue to operate while ARB attempts to address NOx emissions from biodiesel in a
    way that complies the writ and CEQA.
    4.     Severability of Portions of the LCFS Regulations
    Next, we consider whether severing and suspending only a part of the 2015 LCFS
    regulations is permissible under section 21168.9, subdivision (b). There are many ways
    to divide the provisions of the 2015 LCFS regulations. For instance, as the CEQA
    violation concerns only NOx emissions from biodiesel, severance and suspension might
    be limited to (1) the provisions relating to biodiesel; (2) the provisions addressing all
    substitutes for conventional diesel, which substitutes include biodiesel and renewable
    diesel; or (3) the provisions addressing all types of diesel fuel, conventional or otherwise.
    As to the first possibility, plaintiffs and ARB both suggest in their supplemental
    letter briefs that the biodiesel provisions in the LCFS regulations could be severed from
    the remainder of the LCFS regulations. They contend that severing and suspending the
    biodiesel provisions would increase the price of credits, which would have the beneficial
    impact of stimulating the production of fuels with lower carbon intensity values.
    49.
    Despite the agreement of the parties, we reject a severance of the biodiesel
    provisions from the remainder of the LCFS regulations. Such a severance would place a
    disproportionate share of the financial burden of the increase in credit costs on the
    reporting entities that relied most heavily on biodiesel to bring down the average carbon
    intensity of the fuels they handled. This shift in the way the costs of the LCFS regulation
    are borne leads us to conclude the provisions relating to biodiesel are not functionally
    separable from the remainder of the regulation. The shift in costs would materially affect
    the operation of the regulatory scheme as to diesel such that the diesel portion of the
    scheme could no longer be regarded as functioning like the original scheme.
    
    (Matosantos, supra
    , 53 Cal.4th at p. 271.) In other words, the scheme as to diesel fuel
    and its substitutes would no longer be complete in itself.
    The provisions involving biodiesel are intertwined with the provisions regulating
    the entire category of diesel fuels. For instance, the compliance schedule (stated in terms
    of average carbon intensity) addresses ―Diesel Fuel and Fuels used as a Substitute for
    Diesel Fuel‖ as a single category for the years 2011 to 2020. (Cal. Code of Regs., tit. 17,
    § 95484, subd. (c).) As result, severing the biodiesel provisions would alter how
    reporting entities (i.e., fuel blenders, producers, importers and providers) meet the
    compliance schedule and that alteration would significantly change how the regulatory
    scheme functions as to diesel. In particular, reporting entities that had relied on biodiesel
    to reduce the carbon content of their conventional diesel fuel would have to rely on
    alternate strategies, such as buying and retiring carbon intensity credits or replacing the
    biodiesel with renewable diesel. As noted by ARB, California already uses more than its
    proportionate share of the nation‘s renewable diesel and that share would have to increase
    if reporting entities substituted renewable diesel for biodiesel to achieve the requisite
    average carbon content. Thus, invalidating only the biodiesel provisions would disrupt
    the market for diesel fuel substitutes by making biodiesel less valuable while making
    renewable diesel and credits more expensive.
    50.
    As to the second possibility, broadening the severance and suspension to include
    the provisions relating to all substitutes for conventional diesel would not solve the
    foregoing problem. Under a scenario where neither biodiesel nor renewable diesel could
    be reported to reduce the average carbon content of the conventional diesel fuel handled
    by a reporting entity, the entity would have even more difficultly in meeting the
    compliance schedule. Therefore, we conclude neither the provisions relating solely to
    biodiesel nor the provisions relating to all substitutes for conventional diesel should be
    severed from the remainder of the 2015 LCFS regulations.
    The third possibility involves severing the provisions relating to conventional
    diesel fuel and all its substitutes from the remainder of the 2015 LCFS regulations. This
    possibility, unlike the two possibilities previously discussed, was explicitly discussed by
    ARB as one of three possible alternatives to the project addressed in the final
    Environmental Analysis. That alternative project ―would remove the diesel standard
    from the proposed LCFS regulation‖ and would address only gasoline and gasoline
    substitutes. ARB‘s consideration of this alternative demonstrates that it is feasible to
    sever the diesel provisions from the remaining provisions of the LCFS regulations.
    (Guidelines, §§ 15126.6, subd. (a), 15364 [definition of feasible].) This gasoline-only
    alternative was not rejected on the ground it would destroy the regulatory scheme or its
    utility. Instead, it was rejected because ARB determined greenhouse gas emissions could
    be more effectively reduced by including diesel in the regulation. The test for functional
    separability does not consider if the entire regulation is more effective, it considers
    whether the remainder is complete in itself and retains its utility. Here, the LCFS
    regulations would retain some utility if the diesel provisions were excluded because the
    gasoline provisions would continue to operate and reduce greenhouse gases.
    Furthermore, this type of severance would not place the financial burden of ARB‘s
    failure to comply with the writ on those reporting entities who handled diesel and
    previously relied on biodiesel to lower their average carbon intensity.
    51.
    Severing the provisions of the LCFS regulations relating to all diesel fuels also
    meets the two other criteria in section 21168.9, subdivision (b). The provisions of the
    LCFS regulations addressing gasoline are in compliance with CEQA because the CEQA
    violation involving the analysis of NOx emissions from biodiesel did not affect the
    provisions addressing gasoline. (§ 21168.9, subd. (b).) Also, the record and arguments
    presented do not show that severing the provisions of the LCFS regulations relating to
    gasoline and allowing those provisions to remain in effect would prejudice ARB‘s
    complete and full compliance with CEQA in connection with NOx emissions from
    biodiesel. (Ibid.)
    Therefore, we conclude that the portion of the LCFS regulations that address fuels
    other than diesel fuel and its substitutes involve project activities that do not need to be
    suspended for ARB to achieve compliance with CEQA on remand. The possibility of
    severing and suspending the portion of the LCFS regulations addressing diesel fuel and
    its substitutes leads us to the more specific question of whether suspension of those
    provisions is an appropriate remedy in this appeal.
    5.     Suspending the Diesel Portions of the LCFS Regulations
    In Poet I, the CEQA violations relating to the decision maker tainted the approval
    of the entire project and, thus, we did not consider suspending only a portion of the
    regulations. Instead, we considered whether to suspend the LCFS regulations in their
    entirety, which was a remedy within the discretionary authority granted by section
    21168.9. (Poet 
    I, supra
    , 218 Cal.App.4th at p. 761.) We stated that the potential
    suspension of the LCFS regulations was ―the most controversial issue regarding judicial
    relief presented in this appeal.‖ (Ibid.) We identified two CEQA provisions addressing
    whether suspension is appropriate:
    ―First, suspension requires a finding ‗that a specific project activity or
    activities will prejudice the consideration or implementation of particular
    mitigation measures or alternatives to the project .…‘ (§ 21168.9, subd.
    52.
    (a)(2).) Second, the suspension appears to be limited to project activity
    ‗that could result in an adverse change or alteration to the physical
    environment .…‘ (§ 21168.9, subd. (a)(2).)‖ (Poet 
    I, supra
    , 218
    Cal.App.4th at p. 761.)
    We applied these two provisions to the record and arguments presented in Poet I
    and reached the unusual conclusion of allowing the LCFS regulations to remain in
    operation while ARB undertook its corrective action. (Poet 
    I, supra
    , 218 Cal.App.4th at
    pp. 762-763.) These same statutory provisions must be considered here in analyzing
    whether to suspend the portion of the LCFS regulations addressing diesel fuel and its
    substitutes.
    Our first inquiry addresses whether allowing the portion of the LCFS regulations
    addressing diesel fuel and its substitutes to remain in effect would ―prejudice the
    consideration or implementation of particular mitigation measures or alternatives to the
    project.‖ (§ 21168.9, subd. (a)(2).) In Poet I, we concluded that leaving the written
    standards in the original LCFS regulations in place instead of suspending them would not
    affect ARB‘s consideration of mitigations measures and alternatives. (Poet 
    I, supra
    , 218
    Cal.App.4th at p. 762.) Plaintiffs argue we should not reach the same conclusion here
    because they have ―demonstrated that, so long as the LCFS regulation remains in place,
    [ARB] will cut analytical corners, and refuse to consider alternatives and mitigation—all
    to the detriment of communities affected by criteria pollutants such as NOx—simply to
    defend the continuing existence of the LCFS program.‖ Plaintiffs refer to ARB‘s
    analysis of alternatives after the issuance of the February 2014 writ, noting that ARB
    considered only a ―no project‖ alternative and various iterations of the LCFS regulation
    and declined to consider feasible alternatives presented by the public.
    Plaintiffs‘ arguments about bureaucratic momentum are realistic and have some
    merit. However, those arguments must be placed in the context of this case, which
    involves CEQA violations on a narrow topic (i.e., NOx emissions from biodiesel) and not
    CEQA violations that taint the entire project. Furthermore, any lack of discussion about
    53.
    alternatives geared to biodiesel makes sense because alternatives are considered only
    after a significant environmental effect has been identified. (See Guidelines, § 15126.6
    [consideration of alternatives].) Here, ARB‘s flawed analysis of biodiesel ended before it
    decided (1) how much, if any, increase in biodiesel use was attributable to the LCFS
    regulations and (2) whether the NOx emissions associated with that increase in biodiesel
    use, if any, constituted a significant environmental effect. Consequently, any previous
    lack of discussion of alternatives to the biodiesel provisions was understandable,
    considering the order in which CEQA issues are addressed. Therefore, we conclude
    ARB‘s recalcitrance on other matters does not show it is unwilling to consider
    alternatives to the biodiesel provisions, in the event those provisions are found to cause a
    significant environmental impact.
    Next, we consider the question of prejudice from the point of view of what would
    happen if the LCFS regulations addressing diesel fuel and its substitutes were suspended.
    Specifically, would ―suspending the operation of [that portion] of the LCFS regulations
    … open for consideration mitigation measures and alternatives that would have been
    infeasible without the suspension‖? (Poet 
    I, supra
    , 218 Cal.App.4th at p. 762.) Here, we
    are not able to identify alternatives or mitigation measures that are infeasible without
    suspension and become feasible with the suspension of the operation of the provisions in
    the LCFS regulations addressing diesel fuel and its substitutes. Consequently, we cannot
    affirmatively find ―that a specific project activity or activities will prejudice the
    consideration or implementation of particular mitigation measures or alternatives to the
    project.‖ (§ 21168.9, subd. (a)(2), italics added.)
    Our second inquiry under subdivision (a)(2) of section 21168.9 relates to whether
    suspension of the portion of the LCFS regulations addressing diesel fuel and its
    substitutes is warranted because that portion of the project activity ―could result in an
    adverse change or alteration to the physical environment.‖ (Italics added.) This inquiry
    includes distinct questions of fact. First, could the provisions in the LCFS regulations
    54.
    addressing diesel fuel cause an increase in biodiesel usage in California? Second, could
    any increase in biodiesel use attributable to the LCFS standards cause an increase in NOx
    emissions? Third, if increased NOx emissions have or will be caused, is the adverse
    change to the physical environment attributable to that increase outweighed by the
    reduction in other pollutants caused by leaving the portion of the LCFS regulations
    addressing diesel fuel and its substitutes in place? (See Poet 
    I, supra
    , 218 Cal.App.4th at
    p. 762; see fn. 6, ante [baby-with-the-bathwater problem].)
    The levels of certainty required to resolve these factual questions is addressed by
    the statutory phrase ―could result.‖ (§ 21168.9, subd. (a)(2).) In this context, ―could‖
    refers to future events. Consequently, ―could‖ was not used as the past tense of ―can,‖
    which refers to past ability. (Quinones v. Pin (2009) 
    298 S.W.3d 806
    , 816.) In reference
    to future events, ―could‖ is used to indicate possibility, meaning essentially the same
    thing as ―might.‖ (Ibid.; Dorrin v. Union Electric Co. (1979) 
    581 S.W.2d 852
    , 859
    [―could‖ denotes mere capability and often is used as meaning ―might‖].) In this context,
    the most likely interpretation of the ambiguous phrase ―could result‖ is that it denotes the
    level of certainty contained in the fair argument standard. Thus, suspension of a project
    activity pending compliance with CEQA may be an appropriate remedy when there is a
    fair argument that the project activity might result in an adverse environmental impact.
    Conversely, suspension of a project activity is not appropriate when the possibility of an
    adverse environmental impact resulting from that activity falls below the fair argument
    standard.
    The parties dispute whether the LCFS regulations are and will be a cause in fact of
    increased usage of biodiesel. The final Environmental Analysis does not include a
    definitive finding. It states that, given the federal fuel regulations, the federal tax
    incentives, and other factors, ―it is certainly possible that biodiesel use in California
    would continue at or near existing levels—or even increase—in the absence of the LCFS
    regulation.‖ Plaintiffs refer to the statement in the final Environmental Analysis that
    55.
    biodiesel ―has been incentivized under the existing LCFS Regulation beginning in 2009.‖
    (Underlining omitted.)19 The foregoing statements leaves open the possibility that some
    of the increase in California‘s use of biodiesel may be caused by the provisions of the
    LCFS regulations that address diesel fuels and its substitutes. Accordingly, we conclude
    those provisions ―could result in‖ increased usage of biodiesel in the future. (§ 21168.9,
    subd. (a)(2).)
    If the provisions of the LCFS regulations that address diesel fuels and its
    substitutes increase biodiesel usage, could that increased usage cause an increase in NOx
    emissions? We conclude that it could because using biodiesel results in more NOx
    emissions than using replacement fuels. Specifically, conventional diesel and renewable
    diesel result in lower NOx emissions. Therefore, if the diesel provisions in the LCFS
    regulations ―could result in‖ an increase in biodiesel use, they also ―could result in‖ an
    increase in NOx emissions. (§ 21168.9, subd. (a)(2).)
    Our inquiry into whether suspension of the diesel provisions in the LCFS
    regulations ―could result in an adverse change or alteration to the physical environment‖
    (§ 21168.9, subd. (a)(2)) leads us to conclude that the provisions ―could result in an
    adverse change‖ due to increased NOx emissions. This conclusion lends support to
    suspending the diesel provisions of the LCFS regulations pending ARB‘s compliance
    with CEQA. However, such an exercise of our discretionary authority involves further
    considerations—particularly, the overall environmental impact of suspension and
    plaintiffs‘ argument that ARB did not act in good faith.
    Considerations of the overall environmental impact prevented this court from
    suspending the entire LCFS regulations to remedy the CEQA violations found in Poet I.
    (Poet 
    I, supra
    , 218 Cal.App.4th at pp. 762-763.) We stated that the LCFS regulations
    19     Referring to the creation of incentives does not equate to finding those incentives
    actually changed the behavior of reporting entities.
    56.
    ―impact on a wide range of air pollutants is not easily quantified‖ and that ―the emissions
    of greenhouse gases will be less if the LCFS regulations are allowed to remain in effect.‖
    (Id. at p. 762.) The situation is the same in this appeal. The impact of the diesel
    provisions in the LCFS regulations is difficult to quantify, but suspending all of those
    provisions might reduce the NOx emissions from biodiesel while increasing the
    emissions of greenhouse gases. In other words, leaving the category of diesel fuel and its
    substitutes unregulated by the LCFS regulations would mean reporting entities would not
    need to lower the average carbon content of those fuels. As a result, we conclude that
    suspending the diesel provisions of the LCFS regulations would result in adverse
    environmental impacts due to the increased emissions of greenhouse gases. Weighing
    this actual increase against a potential reduction in NOx emissions favors not suspending
    the diesel provisions of the LCFS regulations.
    6.     Suspension and the Lack of Good Faith
    The last factor we consider in exercising our discretionary authority to fashion a
    remedy in this appeal is plaintiffs‘ claim that ARB failed to act in good faith in
    addressing NOx emissions from biodiesel. Paragraph 11 of the February 2014 writ stated
    ―ARB shall proceed in good faith and without delay‖ and a failure to proceed would
    cause the trial court to immediately suspend the operation of the LCFS regulations and
    vacate the part of the writ that preserved the status quo. Plaintiffs contend the language
    in paragraph 11 should influence the remedy adopted in this appeal.
    Initially, we define what the term ―good faith‖ meant. ―In ordinary usage, the
    phrase ‗good faith‘ is commonly understood as referring to a subjective state of mind.‖
    (Ceja v. Rudolph & Sletten, Inc. (2013) 
    56 Cal. 4th 1113
    , 1120.) A subjective good faith
    standard is satisfied by a state of mind denoting honesty of purpose and freedom from
    intention to mislead or defraud. (Ibid.; Madera Oversight Coalition, Inc. v. County of
    
    Madera, supra
    , 199 Cal.App.4th at p. 103, fn. 32; see People v. Accredited Surety
    57.
    Casualty Company (2014) 
    230 Cal. App. 4th 548
    , 560, fn. 9 [defining subjective good
    faith].) This court used the term ―good faith‖ in the disposition of Poet I with the
    expectation that the parties and trial court would adopt the common understanding and
    treat the term as imposing a subjective standard.
    Next, we apply the subjective good faith standard to the facts presented and
    consider whether ARB‘s remedial action was taken without honesty of purpose or
    sincerity of intentions. ARB‘s remedial action was multifaceted and some of that action
    complied with February 2014 writ and cured the corresponding CEQA and APA
    violations. Only ARB‘s evaluation of NOx emissions from biodiesel failed to comply.
    Therefore, plaintiffs‘ claim that ARB did not act in good faith is limited to ARB‘s
    evaluation of NOx emissions from biodiesel.
    When ARB addressed NOx emissions from biodiesel pursuant to paragraph 3,
    ARB misconstrued the term ―project‖ and wrongly determined the original LCFS
    regulations were not part of the ―project.‖ ARB‘s erroneous view of the ―project‖ also
    provided its justification for choosing the wrong baseline. At the end of part I.E.6, ante,
    we concluded that an objectively reasonable attorney familiar with CEQA, the
    Guidelines, published CEQA decisions discussing the term ―project,‖ and the CEQA
    violation to be remedied would have interpreted paragraph 3‘s use of the term ―project‖
    to include the original LCFS regulations, the 2015 LCFS regulations, and the ADF
    regulations. In other words, ARB‘s misinterpretation of the term ―project‖ was not
    objectively reasonable. Furthermore, ARB‘s actions do not appear to be a sincere
    attempt to provide the public and decision makers with the information required by
    CEQA. Rather, it appears as though ARB was attempting to avoid its disclosure and fact
    finding responsibilities because, among other things, its incorrect interpretation of
    ―project‖ allowed it to skip over the adverse consequences that might have accrued while
    the original LCFS regulations were in effect. Therefore, we conclude most of ARB‘s
    corrective action in response to the February 2014 writ satisfied a subjective good faith
    58.
    standard, but infer the part of ARB‘s corrective action addressing NOx emissions from
    biodiesel did not.
    At oral argument, ARB‘s counsel argued ARB acted in good faith, maintaining
    that under Friends of the College of San Mateo Gardens v. San Mateo County
    Community College Dist. (2016) 1 Cal.5th 937, project definitions are left to the agency‘s
    discretion and are based largely on whether the definition adopted allows accurate
    information to be disclosed to the public. This argument further illustrates ARB‘s
    willingness to ignore the weight of authority to grasp the slenderest of reeds to justify
    misreading the writ. (Cf. fn. 17, ante.) Of the many reasons why ARB‘s reliance on San
    Mateo Gardens is misplaced, we mention only two. First, San Mateo Gardens addressed
    whether section 21166‘s requirement for a subsequent or supplemental EIR applied to the
    facts presented. (San Mateo 
    Gardens, supra
    , at pp. 943-944.) In contrast, this appeal
    does not involve section 21166 or a determination by ARB whether a supplemental EIR
    is required. Second, the Supreme Court did not overturn, explicitly or by implication,
    this court‘s conclusion that the question of which acts make up the whole of the action
    constituting the CEQA project is a question of law (i.e., is not a discretionary
    determination) resolved without deference to the agency‘s determination. (Tuolumne
    
    CCRG, supra
    , 155 Cal.App.4th at p. 1224.)
    Having decided ARB did not act in good faith, we address the role ARB‘s lack of
    good faith should have in determining the appropriate relief in this appeal. The agency‘s
    good faith is not a factor identified in section 21168.9, but we consider it relevant to the
    exercise of our discretionary authority to fashion appropriate appellate relief in this
    case.20 Nonetheless, the tail should not wag the dog and the goals of CEQA should not
    20      Also, our disposition in Poet I directed ARB to proceed in good faith without
    delay in taking its corrective action and stated a failure to proceed in good faith would
    result in vacating the provisions in paragraph 6 of the writ that preserved the status quo
    and suspending the operation of the original LCFS regulations. (Poet 
    I, supra
    , 218
    Cal.App.4th at p. 767; see pt. II.C.2, ante.) Thus, we considered ARB‘s good faith as a
    59.
    be compromised to punish agency bad faith. In other words, the relief granted in this
    appeal should serve the public interest by protecting the environment and providing
    information to the public and decision makers. Conversely, the relief granted should not
    harm the environment in order to punish an agency. The only way to justify such relief
    would be if the benefits derived from deterring future agency misconduct clearly
    outweighed the adverse environmental effects of that relief. Here, the possible deterrence
    benefit does not meet this test.
    Based on our consideration of all the factors relevant to suspending project
    activity—including the limited scope of ARB‘s lack of good faith in taking corrective
    action—we conclude that the provisions in the LCFS regulations addressing diesel fuel
    and its substitutes, though severable, should not be suspended while ARB makes another
    attempt at analyzing NOx emissions from biodiesel in a manner that complies with
    CEQA and the writ.
    7.     Maintaining the Status Quo
    The final question about the relief granted in this appeal relates to whether we
    should include a provision preserving the status quo pending ARB‘s compliance with the
    writ and CEQA. Freezing the standards contained throughout the 2015 LCFS regulations
    is not appropriate because the ongoing CEQA violation involves only NOx emissions
    from biodiesel. Therefore, the status quo provisions in paragraph 6 of the February 2014
    writ will be modified.
    Any preservation of the status quo should be limited to the provisions (1) tainted
    by the CEQA violation and (2) severable from the remainder of the LCFS regulations.
    Those provisions of the LCFS regulations govern diesel fuel and its substitutes. (See pt.
    II.F.5, ante.) Freezing these standards would create an incentive for ARB to complete the
    factor affecting the remedy imposed in Poet I and we continue to adhere to that general
    principle in this appeal.
    60.
    required environmental disclosures and make the findings about NOx emissions and, if
    required, mitigation measures and alternatives. The provisions addressing gasoline,
    natural gas and other transportation fuels would not be affected because they are not
    affected by an ongoing CEQA violation.
    On balance, we conclude it would be appropriate to freeze the standard for the
    severable portion of the regulations—specifically, the standards applicable to diesel fuel
    and its substitutes. Accordingly, the 2017 standards applicable to diesel fuel and its
    substitutes shall remain the operative standards until ARB has obtained a discharge of the
    writ from the trial court.
    G.     Guidance as to the Baseline on Remand
    ARB has requested, in effect, that we endorse its use of a 2010 baseline on
    remand. ARB‘s theory for use of a 2010 baseline is grounded on the fact that 2010 was a
    reporting year21 only and the carbon intensity requirements in the original LCFS
    regulations did not take effect until January 1, 2011. Thus, ARB reasons that the project
    could not have caused any changes in biodiesel use during 2010.
    Approving the use a 2010 baseline is inappropriate for a number of reasons, three
    of which we discuss here. First, Guidelines section 15125, subdivision (a) normally
    requires the use of an existing conditions baseline, which means the conditions ―as they
    exist … at the time environmental analysis is commenced.‖ The ISOR published on
    March 5, 2009, contained an environmental disclosure document, which demonstrates
    that the environmental analysis conducted by ARB commenced before that date. It
    follows that a 2010 baseline would not be an existing conditions baseline for purposes of
    21     Under the original LCFS regulations, only the reporting, recordkeeping and
    auditing provisions applied during 2010, while the carbon intensity and other
    requirements started applying January 1, 2011. (Cal. Code of Regs., tit. 17, former §
    95480.1, subd. (a).)
    61.
    Guidelines section 15125, subdivision (a). Consequently, if ARB wishes to use a 2010
    baseline on remand, it must justify that departure from the norm and support that
    justification with substantial evidence. (Neighbors for Smart 
    Rail, supra
    , 57 Cal.4th at p.
    448 [departure justified ―when necessary to prevent misinforming or misleading the
    public and decision makers‖].)
    Second, ARB‘s argument is oblivious to the possibility that reporting entities
    began adapting to the new regulation (i.e., modifying their behavior) prior to the effective
    date of the carbon intensity requirements contained in the original LCFS regulations.
    ARB previously recognized this possibility in its final Environmental Analysis, which
    stated that biodiesel ―has been incentivized under the existing LCFS Regulation
    beginning in 2009.‖ (Underlining omitted, italics added.) At a minimum, this statement
    suggests that reporting entities began modifying their behavior by increasing production
    and imports of biodiesel in 2009, effectively gearing up for the carbon intensity
    requirements that would be applied at a later date. Whether or not reporting entities did,
    and whether the volume of biodiesel used in 2009 or 2010 increased because of the
    consideration or adoption of the original LCFS regulations present questions of fact that
    must be decided by the agency in the first instance.22
    Third, the issue of whether using NOx emissions in 2010 would comply with
    CEQA is not properly before this court because the hypothetical use of a 2010 baseline
    on remand is not one of the ―grounds for noncompliance‖ which CEQA alleged in this
    appeal. (See § 21005, subd. (c).) Here, a ground for noncompliance was ARB‘s use of a
    2014 baseline. Furthermore, the issue is not an ―actual controversy‖ for purposes of
    22      ARB‘s failure to recognize the factual issues underlying the choice of a NOx
    baseline means it has cited no evidence tending to prove biodiesel producers only reacted
    to the original LCFS regulations and began producing more biodiesel after the carbon
    intensity requirements kicked in at the start of 2011. ARB‘s failure to recognize the
    underlying factual issues also indicates a misunderstanding of, or an unwillingness to
    apply, the limits CEQA and the Guidelines place on its selection of a baseline.
    62.
    Code of Civil Procedure section 1060 and any conclusions reached by us would be
    merely an advisory opinion. (See Stonehouse Homes LLC v. City of Sierra Madre (2008)
    
    167 Cal. App. 4th 531
    , 542 [court declined to issue an advisory opinion on a controversy
    that did not yet exist].)
    Accordingly, we will not decide whether a 2010 baseline is appropriate for use on
    remand. Furthermore, we limit our informal guidance on the choice of baseline to the
    following observations. First, ARB should determine when it commenced its
    environmental analysis of the original LCFS regulations. Second, if ARB chooses to
    adopt a baseline other than the normal, existing conditions baseline, it must provide an
    adequate justification for that choice and support that justification with substantial
    evidence. For instance, a conclusory statement that an existing conditions baseline would
    be misleading is not an adequate justification. Third, the choice of an existing conditions
    baseline would avoid challenges to that choice based on the argument that baseline
    chosen includes increases in biodiesel use because reporting entities already had begun
    modifying their behavior in anticipation of the adoption or implementation of the original
    LCFS regulations.
    DISPOSITION
    The order discharging the peremptory writ of mandate is reversed. The superior
    court is directed to vacate that order and enter a new order (1) stating the Air Resources
    Board‘s return did not demonstrate compliance with paragraph 3 the peremptory writ of
    mandate and (2) denying the Air Resources Board‘s request for an order discharging the
    writ.
    The superior court shall issue further orders to compel the Air Resources Board‘s
    obedience to the writ and CEQA, including modifying the writ to compel the Air
    Resources Board to take the following action:
    (1) Set aside its 2015 approval of the parts of the final Environmental Analysis
    addressing NOx emissions from biodiesel.
    63.
    (2) Address whether the project as a whole ―is likely to have‖23 caused an increase
    in NOx emissions in the past and is likely to cause an increase in NOx emissions in the
    future. The baseline used for analyzing each period‘s NOx emissions shall reflect the
    conditions existing at the time the environmental analysis of the original LCFS
    regulations was commenced, unless Air Resources Board provides sufficient justification,
    supported by substantial evidence, for use of a later baseline. In no event shall the
    baseline conditions describe a year later than 2010. The discussion in the environmental
    disclosure document shall comply with CEQA, including without limitation an analysis
    and findings addressing whether the project as a whole is likely to have caused an
    increase in NOx emissions in the past and whether the project as a whole is likely to
    cause increases in NOx emissions in the future. After identifying the increased NOx
    emissions attributable to the project as a whole on a year-by-year basis, the disclosure
    document shall address whether the increased emissions had, or are likely to have, a
    significant adverse effect on the environment or are cumulatively considerable. Findings
    on the foregoing matters shall be supported by substantial evidence. Findings as to the
    causes for future biodiesel use shall take into account that the incentives provided by
    federal regulations have or will change over time (e.g., the expiration of the excise tax
    credits). If required by CEQA, the disclosure document shall address mitigation
    measures and alternatives to the provisions in the regulations addressing diesel fuel and
    its substitutes.
    (3) Preserve the status quo relating to conventional diesel fuel and its substitutes
    by continuing to adhere to the standards in effect during 2017 for those fuels until the
    corrective action is complete and approved by the trial court in an order discharging the
    writ.24
    23        The phrase ―is likely to have‖ appears in section 21061.
    24        This provision replaces paragraph 6 of the February 2014 writ.
    64.
    (4) Proceed in the manner required by CEQA when resolving procedural issues,
    such as whether the revised environmental disclosure documents are released for public
    review and comments.
    The statements that follow are intended to aid in the interpretation and application
    of the foregoing modifications. First, the modifications to the writ shall not affect the
    validity and continuing operation of the ADF regulations. Second, there shall be no
    striking of text from the LCFS regulations; rather, the freeze of the standards for
    conventional diesel and its substitutes shall operate in the manner of an injunction rather
    than voiding or invalidating provisions that would have come into effect in 2018 and
    later. Third, Air Resources Board need not suspend its consideration or approval of
    additional fuel pathways for diesel fuel and its substitutes.25
    The superior court shall continue to retain jurisdiction over the proceedings by
    way of a return to the writ. The superior court may, in an exercise of its discretion,
    require the Air Resources Board to file an initial return after issuing the order modifying
    the February 2014 writ. The superior court‘s jurisdiction shall include the authority to
    hear a motion for clarification of the terms of the modified writ if the parties dispute its
    proper interpretation or application. The superior court may hear such a motion on an
    expedited basis and its decision may be subject to writ review by this court.
    Interpretation of this disposition and the writ shall be in accordance with CEQA‘s
    requirements, principles and polices.
    The superior court shall require the Air Resources Board to proceed diligently,
    reasonably and in subjective good faith while implementing corrective action pursuant to
    the modified writ and filing a final return. If the Air Resources Board fails to proceed in
    this manner, the superior court immediately shall vacate the portion of the writ that
    25    This statement is inherent in previous statements, but we include a redundancy
    because the parties raised the fate of new pathways during oral argument.
    65.
    preserves the status quo with respect to the standards applicable to diesel fuel and its
    substitutes and shall direct the Air Resources Board to set aside the provisions of the
    LCFS regulations applicable to diesel fuel and its substitutes (i.e., suspend the operation
    and enforcement of those provisions) and, in its discretion, may impose other sanctions.
    If the Air Resources Board‘s corrective action requires a notice of approval of regulatory
    action from the Office of Administrative Law, the Air Resources Board may file its final
    return before obtaining that notice; if it chooses to wait for the approval, it shall
    demonstrate the necessity for that delay in its final return.
    Nothing in this disposition or the writ shall prevent the Air Resources Board from
    taking action addressing issues currently raised in other litigation when it takes the
    corrective action required by this writ.26 Plaintiffs shall recover their costs on appeal.
    _____________________
    FRANSON, J.
    WE CONCUR:
    _____________________
    KANE, Acting P.J.
    _____________________
    SMITH, J.
    26      For instance, Air Resources Board might chose to exercise its discretion and
    provide an additional analysis of ―reasonably foreseeable indirect physical changes to the
    environment‖ (Guidelines, § 15378, subd. (a)) that may have been caused by the project,
    such as the impacts of fuel shuffling alleged by plaintiffs. The reasonably foreseeable
    changes resulting from alterations in the behavior of third parties subject to a new law
    was discussed in detail by this court in County Sanitation Dist. No. 2 v. County of Kern
    (2005) 
    127 Cal. App. 4th 1544
    , at pages 1582 through 1598. That case discussed the
    reasonably foreseeable indirect physical changes, both inside and outside the county,
    resulting from the reaction of third parties to the requirements of a new ordinance
    addressing sewage sludge disposal.
    66.