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One of the questions the Court has agreed to take up in these cases is whether, in delegating the power to The EPA to regulate greenhouse gas emissions, Congress exceeded those limits, if the Court says yes, that will not just curtail the EPA's power to respond to climate change in a moment in which it's hard to imagine that Congress will fill the gap ; it would have enormous implications for -- and impose far greater limits on -- the federal government's regulatory power writ large.