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        Activists Protest Proposed Canadian Tar Sands Oil Pipeline | Human Impact on the Physical Environment | Geography

        WASHINGTON, DC - AUGUST 22: More than 50 demonstrators sit down in front of the White House along Pennsylvania Avenue while protesting against a proposed pipeline that would bring tar sands oil to the U.S. from Canada August 22, 2011 in Washington, DC. The U.S. Park Police arrested about 40 people during the peaceful demonstration. (Photo by Chip Somodevilla/Getty Images)

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