"Greenhouse gases Environmental aspects United States." . . "Global warming Economic aspects United States." . . "Global warming Economic aspects." . . "Global warming." . . "United States." . . "Environmental policy United States." . . . . . . . . . . . . . . . "Legislative hearings"@en . . . "Update on the latest global warming science : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Eleventh Congress, first session, February 25, 2009"@en . . "Climatic changes Economic aspects." . . "United States. Congress. Senate. Committee on Environment and Public Works," . . "Greenhouse gases Environmental aspects." . . . . "Environmental policy." . . "Climatic changes Economic aspects United States." . . "Greenhouse effect, Atmospheric." . .