EPA has filed a long-awaited brief defending its power plant new source performance standards (NSPS), the legal prerequisite of its landmark greenhouse gas rule for existing plants, providing a roadmap for environmentalists, states and other supporters who will continue to defend it when the incoming Trump administration takes office in January and seeks to roll back the rule. The agency Dec. 14 filed its opening brief in the case, State of North Dakota, et al. v. EPA, et al .,...