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Major questions doctrine. They ruled that the current law does not empower EPA to require producers to shift generation to different methods (e.g. natural gas, renewables), and that if Congress had meant for the law to do that, they would have written it explicitly. Congress can still pass a law empowering EPA to regulate greenhouse gas emissions. |
Congress gave the EPA broad discretion that it could have revoked -- using your argument -- at any moment. This issue has been bouncing around for over a decade, and Congress has systematically declined to do so.