Shift Key with Robinson Meyer Trump’s Assault on the Clean Air Act and What Happens Next
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Feb 16, 2026 
Jody Freeman, Harvard Law professor and former Obama White House climate counselor, explains how the Trump administration’s repeal targets EPA authority under the Clean Air Act. She walks through the administration’s shifting legal arguments, how the courts might respond, and what it means for power plant and vehicle regulation. They also consider whether repeal could shift climate fights to states and cities.
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Repeal Targets EPA Climate Authority
- The Trump administration moved to repeal the EPA's endangerment finding, aiming to strip EPA authority over greenhouse gases.
- If upheld, this would severely limit future federal climate regulation under the Clean Air Act.
Mass v. EPA Laid The Groundwork
- Massachusetts v. EPA established that greenhouse gases are pollutants regulable under the Clean Air Act.
- The Obama administration used that ruling to make an endangerment finding and begin regulating vehicle emissions.
Two Legal Routes To Nullify EPA
- The administration's legal theory says either the Clean Air Act only covers local pollution or U.S. vehicle emissions are too trivial a 'contribution' to regulate.
- Both routes aim to nullify EPA action without directly contesting the underlying climate science.