. . . "Finding that manmade pollution--the release of carbon dioxide, chlorofluorocarbons, methane, and other trace gases into the atmosphere--may be producing a long-term and substantial increase in the average temperature on Earth, ?? 1102(1), 101 Stat. 1408, Congress directed EPA to propose to Congress a coordinated national policy on global climate change, ?? 1103(b), and ordered the Secretary of" .