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Two dozen states, 10 cities sue EPA over repeal of ‘endangerment’ finding central to climate fight

The lawsuit argues the EPA's repeal of the 2009 Endangerment Finding removes key emissions standards and violates the Clean Air Act, with 24 states and multiple cities joining the challenge.

  • On Thursday, two dozen states, 10 cities and five counties filed suit in the U.S. Court of Appeals for the District of Columbia Circuit challenging the Environmental Protection Agency’s February repeal of the 2009 Endangerment Finding.
  • The 2009 Endangerment Finding determined carbon dioxide and other greenhouse gases endanger public health and welfare, growing from the 2007 Supreme Court decision Massachusetts v. EPA under the Clean Air Act.
  • Led by the attorneys general of California, Connecticut, Massachusetts and New York, the suit includes 19 other states, Washington, D.C., Pennsylvania Gov. Josh Shapiro, cities like Boston and Los Angeles, plus five counties.
  • The repeal eliminates all greenhouse-gas emissions standards for cars and trucks and experts warn it could enable broader rollbacks for power plants and oil and gas facilities.
  • Courts have repeatedly upheld the Endangerment Finding, including a 2023 D.C. Circuit decision, and the case may produce a years-long saga potentially reaching the more conservative U.S. Supreme Court.
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California co-leads states suing EPA over greenhouse gases

(The Center Square) – California Attorney General Rob Bonta is co-leading a nationwide lawsuit against the U.S. Environmental Protection Agency over its rescission of a finding on greenhouse gases.

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Two dozen states, 10 cities sue EPA over repeal of 'endangerment' finding central to climate fight

Two dozen states, along with more than a dozen cities and counties, sued the Environmental Protection Agency on Thursday, challenging the Trump administration’s repeal of a scientific finding that had been the central basis for U.S. action to regulate greenhouse gas emissions and fight climate chang

·United States
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KQED broke the news in San Francisco, United States on Thursday, March 19, 2026.
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