When Congress seems slow to solve problems, it may be only natural that those in the Executive Branch might seek to take matters into their own hands. But the Constitution does not authorize agencies to use pen-and-phone regulations as substitutes for laws passed by the people’s representatives.
Justice Gorsuch in concurrence
Capping carbon dioxide emissions at a level that will force a nationwide transition away from the use of coal to generate electricity may be a sensible “solution to the crisis of the day.” New York v. United States, 505 U. S. 144, 187 (1992). But it is not plausible that Congress gave EPA the authority to adopt on its own such a regulatory scheme in Section 111(d). A decision of such magnitude and consequence rests with Congress itself, or an agency acting pursuant to a clear delegation from that representative body.
Justice Roberts for the majority
At first glance, the SCOTUS decision would seem to affect the regulation of GHG emissions on the OCS and possibly the Lease Sale 257 decision (now being appeal), which was based on BOEM’s failure to estimate the effect of reduced OCS production on GHG emissions outside the US.
Bud's Offshore Energy (BOE) 
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