The U.S. Supreme Court on June 23 upheld the authority of the U.S. Environmental Protection Agency (EPA) to regulate greenhouse-gas (GHG) emissions for stationary industrial sources that also emit other pollutants “anyway.” However, the Court, in a 5-4 vote, simultaneously decided that the EPA GHG rules cannot apply to stationary sources that only would emit GHG—and not other regulated pollutants. Nor can the EPA continue to exempt “small” emitters (defined as sources emitting less than 75,000 tons per year [tons/year] of GHG)—at least not under the rules as currently written, according to the Court.
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