This story was originally published by Grist and is reproduced here as part of the Climate Desk collaboration. In a ruling that court observers said was “really extraordinary” and achieved through “a procedural strangeness,” the Supreme Court on Thursday blocked a federal plan to reduce air pollution that blows across state lines. The 5-4 decision from the court’s conservative justices halts, for now, the Environmental Protection Agency’s “Good Neighbor” rule and its stringent smokestack emissions requirements on power plants and other industrial sources.