JUSTICE REHNQUIST delivered the opinion of the Court.
In 1979, following a year of study and public comment, the Environmental Protection Agency (EPA) promulgated standards limiting the emission of sulfur dioxide by coalburning powerplants. Both respondents in this case — the Environmental Defense Fund (EDF) and the Sierra Club — filed petitions for review of the agency's action in the United States Court of Appeals for the District of Columbia Circuit...
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