The Trump administration is poised to revoke the Obama-era endangerment finding, the scientific bedrock for federal greenhouse gas regulation. EPA Administrator Lee Zeldin called the move the largest act of deregulation in U.S. history, targeting the legal basis for vehicle emissions rules. This action would dismantle a cornerstone of U.S. climate policy.

After a year of work and over 500,000 public comments, the proposal reached the White House for review on January 7. A January 30 court ruling previously faulted the Department of Energy for a flawed advisory group supporting the repeal, creating immediate legal vulnerability for the final rule. The change would end compliance requirements for new vehicles but spare power plant regulations.

Industry support fractured; while some groups back repealing vehicle rules, many fear destabilizing regulatory certainty. The American Petroleum Institute publicly supported rescinding the finding for vehicles but insisted it must remain for stationary sources like oil and gas methane. The repeal directly reshapes auto industry obligations and invites swift legal challenges.