Overview
- Administrator Lee Zeldin finalized the rollback with President Trump, calling it the largest deregulatory action in U.S. history and citing roughly $1.3 trillion in projected savings and about $2,400 lower average vehicle prices.
- The action immediately terminates federal greenhouse‑gas limits for cars and trucks, with automakers already scaling back some electric‑vehicle plans and incentives such as start‑stop systems no longer rewarded.
- California leaders vowed to challenge the move, and groups including Clean Air Task Force filed suit on behalf of health organizations, joining national NGOs that have prepared broader litigation.
- The administration leaned on a Department of Energy climate review later faulted by a federal judge for violating advisory panel rules, while critics point to the National Academies’ 2025 conclusion that evidence for endangerment has strengthened.
- By scrapping the 2009 finding rooted in the Supreme Court’s Massachusetts v. EPA precedent, the move strips a key Clean Air Act basis for federal greenhouse‑gas regulation and could leave a patchwork of state standards and prolonged uncertainty for industry and exports.