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WASHINGTON, DC - April 21: House Select Committee on Energy Independence and Global Warming Chairman Edward J. Markey, D-Mass., House Energy Chairman Henry A. Waxman, D-Calif., North Carolina Wildlife Federation Director Kelly Darden, and House Speaker Nancy Pelosi, D-Calif., during a news conference on climate change legislation. (Photo by Scott J. Ferrell/Congressional Quarterly)

WASHINGTON, DC - April 21: House Select Committee on Energy Independence and Global Warming Chairman Edward J. Markey, D-Mass., House Energy Chairman Henry A. Waxman, D-Calif., North Carolina Wildlife Federation Director Kelly Darden, and House Speaker Nancy Pelosi, D-Calif., during a news conference on climate change legislation. (Photo by Scott J. Ferrell/Congressional Quarterly)

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