After hearing oral arguments last month, the U.S. Court of Appeals for the D.C. Circuit is now deliberating on a case that could determine the fate of the federal Clean Power Plan (CPP). Opponents of the CPP, which sets the nation’s first limits on carbon pollution from power plants, have sued the U.S. Environmental Protection Agency (EPA), claiming regulatory overreach by the federal government. While much of the controversy has focused on industry and states, this is an issue of tremendous consequence to local government. That’s why the Cities of Philadelphia and Pittsburgh support the Clean Power Plan and defended the EPA in court.