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President Trump's decision to withdraw from the Paris climate agreement has taken the uncertainty surrounding U.S. climate policy to a whole new level. 

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Pruitt Touts Vehicle GHG Rules As 'Progress' On CO2 Despite Rollbacks

EPA Administrator Scott Pruitt is touting the Obama administration's light-duty vehicle greenhouse gas standards as the “greatest progress” EPA has made with respect to reducing carbon emissions, comments that appear paradoxical as the Trump administration works to potentially relax those standards and seeks to more broadly undermine climate policy efforts.

California Gov. Jerry Brown (D) is floating proposed changes to the state's post-2020 greenhouse gas cap-and-trade program in a bid to compromise with lawmakers, including a new GHG allowance price ceiling, reduction in the use of offset credits and a separate program to further reduce conventional air pollutants in disadvantaged communities.

EPA is using both the Clean Air Act and the Administrative Procedure Act (APA) to delay Obama-era regulations -- a tactic to buy time for the Trump administration to rewrite the rules -- but environmentalists' challenges to those stalling tactics could be first legal tests to the bounds of EPA's authority to administratively stay its rules.

Three lawsuits in which environmentalists are challenging EPA administrative delays of Obama-era regulations are likely to provide the first legal tests of the agency's authority to stay its rules using administrative tools -- as EPA's use of the statutes has little prior legal precedent and could be legally risky.