The Ninth Circuit affirmed a district court order remanding to state court two climate liability suits against numerous oil and gas companies. The city and county of Honolulu and the county of Maui sued in state court, arguing the companies knew about climate change, understood the harms that energy...

The Ninth Circuit reversed a previous ruling that vacated summary judgment for a California city in a RCRA citizen suit brought by an environmental group. The group had argued the city's water wells were contaminated by hexavalent chromium that was in turn transported to city residents through its w...

The U.S. Supreme Court held, 6-3, that President Barack Obama's EPA had exceeded its statutory authority under §111(d) of the CAA when it promulgated the Clean Power Plan to address carbon dioxide pollution from existing power plants. States and coal companies had petitioned for review of the plan,...