In Massachusetts v. EPA, Massachusetts and other states sued the EPA for not regulating vehicle emissions that may contribute to greenhouse gases. The Supreme Court held that unless Congress orders such emissions to be regulated, there is nothing EPA can do.

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In Massachusetts v. EPA, the Supreme Court held that greenhouse gases were pollutants under the Clean Air Act and that the EPA had a duty to regulate them. The Court found that the EPA's decision not to regulate vehicle emissions was arbitrary and capricious, and ordered the EPA to reconsider its decision. Thus, EPA can regulate emissions that contribute to greenhouse gases.

In Massachusetts V