Massachusetts v. EPA, 549 U.S. 497 (2007), is the landmark Supreme Court decision holding that greenhouse gases are "air pollutants" under the Clean Air Act, and that EPA must determine whether they endanger public health or welfare. The Court rejected EPA's argument that it had discretion to ignore climate science for policy reasons. This decision established states' standing to sue federal agencies for regulatory failures and forced EPA to issue its 2009 endangerment finding. The 2026 repeal of that finding directly contradicts this precedent.
Massachusetts v. EPA established that states can sue the federal government for failing to regulate threats to the environment and public health. The decision forced EPA to regulate greenhouse gases and shaped environmental law for decades. The 2026 repeal of the endangerment finding directly contradicts this precedent.
People often think only the federal government can sue over environmental harms. Massachusetts v. EPA allows states to sue federal agencies for regulatory failures. The decision also established that climate change is an environmental problem the EPA must address under existing law.
Massachusetts v. EPA established that states can sue the federal government for failing to regulate threats to the environment and public health. The decision forced EPA to regulate greenhouse gases and shaped environmental law for decades. The 2026 repeal of the endangerment finding directly contradicts this precedent.
People often think only the federal government can sue over environmental harms. Massachusetts v. EPA allows states to sue federal agencies for regulatory failures. The decision also established that climate change is an environmental problem the EPA must address under existing law.