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 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,...

The Nevada Supreme Court held, 4-3, that the state's top water official had authority to approve a groundwater management plan (GMP) that deviated from the doctrine of prior appropriation for the over-appropriated Diamond Valley Hydrologic Basin. Senior rights holders in the basin sought to invalida...