Despite continued calls for Congress to enact major new environmental legislation, environmentalists and industry officials are shifting away from Capitol Hill to focus on the Obama EPA's ramped up regulatory efforts to address high-priority issues such as climate change, toxic chemicals, and air and water quality using existing authorities. On climate change, for example, the agency is poised in 2010 to finalize a landmark rule limiting vehicle greenhouse (GHG) emissions under the Clean Air Act, also triggering first-time permit limits...