California sent a Freedom of Information Act Request to the EPA for documents related to EPA head Scott Pruitt’s conflicts of interest.

Multi-state lawsuit challenging the federal government’s decision to delay the effective dates of final rules governing energy efficiency for six products.

California and Connecticut intervened in lawsuit challenging EPA’s determination to retain existing GHG emission standards for light-duty vehicles.

Multi-state settlement of consumer-protection claims against car manufacturers that overstated their vehicles’ fuel efficiency.

California Attorney General amended regulations under Proposition 65, a California disclosure law related to exposure to toxic chemicals.

Twelve states joined in defense of EPA’s new source performance standards for methane and VOC emissions from the oil and gas sector.

California AG, working with the federal EPA, entered into two related settlements over Volkswagen’s use of defeat devices to evade emissions testing.

Letters and testimony providing recommendations on federal legislation amending the Toxic Substances Control Act (TSCA) to revise the process and requirements for evaluating and determining whether regulatory control of a chemical is warranted.

Group of 17 state AGs and Former Vice President Al Gore announced a coalition of states committed to taking creative steps to combat climate change, including investigations into fossil fuel companies and climate-related disclosures.

Indictment of Plains All American Pipeline on Criminal Charges Resulting from the Refugio Oil Spill

Oregon, California, and Washington joined in defense of Oregon’s Low Carbon Fuel Standard.

Joint prosecution between the State of California and the County of Ventura against Santa Clara Waste Water, its parent company, and individual employees for criminal violations stemming from hazardous waste disposal.

Multi-state intervention to join EPA’s defense of Clean Power Plan against challenge mounted by other states and industry petitioners.

Multiple states joined as defendant-intervenors in support of EPA in lawsuit challenging New Source Performance Standards (NSPS) for carbon dioxide emissions from new and modified power plants.

Multiple states intervened in lawsuit to defend EPA standards regulating mercury and other air pollutants from the power sector.

Multiple states intervened in lawsuit to defend EPA rules concerning regulation of greenhouse gas emissions from stationary and mobile sources.

Multi-state intervention in support of Energy Department proposed rule setting efficiency standards for residential gas furnaces.

California AG filed an amicus brief in a case involving the Port of Los Angeles “Clean Trucks Program,” which was designed to improve diesel emissions and air quality.

California AG brought a lawsuit against three plastic water bottle companies for misleading claims of biodegradability. This was the first “greenwashing” suit of its kind.

California AG intervened in and helped to settle litigation surrounding an industrial project that was expected to increase diesel truck traffic in a predominantly Latino residential area.

States joined NRDC lawsuit challenging the DOE’s attempt to lower energy efficiency standards for certain appliances under the Energy Policy and Conservation Act (ECPA).

Multi-state lawsuit to force EPA to comply with Clean Air Act requirement to update and revise National Ambient Air Quality Standards (NAAQS) every five years.

California AG intervened in a suit attempting to require the San Diego Association of Governments (SANDAG) Regional Transportation Plan to consider climate change in its long term planning decisions.

Federal common law nuisance claim against five major electric power companies for their contribution to climate change through greenhouse gas emissions.

California sued the U.S. Forest Service for its plan to allow road development through certain wilderness areas in California, including habitats for endangered species. The parties reached a settlement in 2010.

After years of litigation and settlement attempts between environmental and wind turbine industry groups, the California AG’s office stepped in and brokered a settlement to protect migratory birds.

Multiple states moved to intervene in litigation concerning the 2012–2016 light duty motor vehicle emissions standards.

California AG filed brief with the California Public Utility Commission defending the state’s authority to use feed-in tariffs.

Multi-state lawsuit challenging the adequacy of EPA’s 2006 revision to the National Ambient Air Quality Standards (NAAQS) regulating soot pollution under the Clean Air Act.

Multi-state challenge to EPA decision to remove fossil fuel-fired power plants from list of sources regulated under CAA section 112 (hazardous air pollutants) and to establish new performance standards for mercury emissions from these plants under CAA section 111.

Multi-state action against EPA for failure to set NSPS standards for oil refineries.

State AGs intervened in lawsuit to defend California’s greenhouse gas emission standards for motor vehicles against challenge alleging that the standards are preempted by the Energy Policy and Conservation Act (EPCA).

The State of California entered into a landmark climate change settlement with San Bernardino County setting forth a specific greenhouse gas reduction plan.

Multi-state challenge to EPA denial of petition to regulate greenhouse gas emissions from motor vehicles under Clean Air Act.

Washington State intervened and multiple states submitted Amicus Briefs in lawsuit filed by Native American tribe against Canadian smelting company for polluting the Columbia River and Lake Roosevelt.

Multi-state challenge to 2002 EPA rule amending and expanding the routine maintenance, repair and replacement exceptions to the New Source Review program.

Multi-state lawsuit challenging the Department of Energy (DOE)’s failure to create energy efficiency standards for consumer appliances according to the timeline established by the Energy Policy and Conservation Act (ECPA).

Multi-state challenge to 2002 EPA rule amending the New Source Review (NSR) program and narrowing the definition of “modification” to exclude certain sources from NSR requirements.