Twelve states, some local governments, and private organizations sued the EPA, contending that it did not live up to its obligation under the Clean Air Act to regulate greenhouse gases that result from vehicle emissions. EPA responded that its regulations were sufficient and that it need not design more stringent regulations. The appeals court agreed; plaintiffs appealed.

1. The Supreme Court held that the EPA has authority to regulate greenhouse gases, such as carbon dioxide emissions from vehicles. If Massachusetts and other states feel strongly about it, why do those states not address the matter?
2. Does the Supreme Court have the authority to order EPA to control such emissions?