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[Environmental Groups Sue Trump Administration, Challenging the Revocation of Hazard Designations and Exhaust Emissions Rules] ⑴ A coalition of health and environmental organizations filed a lawsuit Wednesday in the U.S. Court of Appeals for the District of Columbia Circuit, challenging the Trump administration's decision to revoke the "hazard designations" that form the basis of U.S. climate regulations. The lawsuit also questions the Environmental Protection Agency's (EPA) announcement last week to repeal exhaust emissions rules restricting greenhouse gas emissions from cars and trucks. ⑵ Last Thursday, the EPA announced it would repeal the 17-year-old "hazard designations" and terminate federal greenhouse gas emission standards for all vehicles and engines manufactured between 2012 and 2027. The agency claims this move will save U.S. taxpayers $1.3 trillion. ⑶ This lawsuit marks the most comprehensive setback to date in the Trump administration's climate change policies, now facing legal challenges. Previously, the administration had taken a series of deregulatory measures aimed at loosening restrictions on fossil fuel development and hindering the promotion of clean energy. Trump has called climate change a hoax and withdrew from the Paris Agreement again. (4) The "hazard designation," first adopted in 2009, forms the legal basis for the Environmental Protection Agency's (EPA) regulation of greenhouse gas emissions such as carbon dioxide and methane from industries like automobiles and power plants under the Clean Air Act. If repealed, the automotive sector would no longer be required to comply with federal greenhouse gas emission standards, but stationary pollution sources such as power plants would remain unaffected for the time being. According to EPA data, the transportation and power industries each account for approximately one-quarter of U.S. greenhouse gas emissions.