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December 8, 2010 5:57 PM

U.S. poised to slurp up more of Canada's dirtiest oil

At the climate talks under way at the Mexican beach resort of Cancun, the U.S. has assured the world it's not backing away from its pledge to reduce greenhouse gas emissions. At the same time, however, the State Department looks likely to approve a pipeline that would increase the use of one of the dirtiest forms of oil.

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