EPA Revokes Clean Air Act Scientific Finding — Calling it the Largest Deregulation in U.S. History
On February 12, 2026 , the U.S. Environmental Protection Agency (EPA) announced a final rule rescinding a foundational Clean Air Act scientific finding that greenhouse gases endanger human health and welfare. The agency described the action as the largest deregulatory move in U.S. history. The original 2009 finding concluded that six greenhouse gases — including carbon dioxide — endanger public health and welfare, establishing the legal basis for federal greenhouse gas regulations affecting motor vehicles, power plants, and certain industrial sources. For employers in manufacturing, automotive, transportation, energy, and related sectors, this represents a significant shift in federal climate regulatory authority, while also introducing potential legal and operational uncertainty. Revocation of the Clean Air Act Scientific Finding The 2009 Endangerment Finding concluded that greenhouse gases — including carbon dioxide, methane, and nitrous oxide — “endanger public health and welf...