The case involved regulating greenhouse gas emissions from power plants.The Supreme Court on Thursday limited the Environmental Protection Agency’s power to fight climate change.The case involved how far the federal government could go in regulating greenhouse gas emissions from power plants.The court held that Congress did not grant EPA in Section 111(d) of the Clean Air Act the authority to devise emissions caps based on the generation shifting approach the Agency took in the Clean Power Plan, with Chief Justice John Roberts writing for the 6-3 conservative majority.