Despite the evidence that climate change is occurring, partisan gridlock and weakening support for climate regulations have stalled the progress of any climate bill in the U.S. Some Republican lawmakers question the validity of emission-led global warming, while some Democratic candidates running for the Senate distance themselves from the cap-and-trade bill passed by the House last year. "I don't see a comprehensive bill going anywhere in the next two years," said Sen. Jeff Bingaman, D-N.M.

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