In this July 13, 2015 photo, construction takes place at the U.S. Oil Sands commercial tar sands operation, in the Book Cliffs, in eastern Utah. On the remote Utah ridge covered in sagebrush, pines and wild grasses, a Canadian company is about to embark on something never before done commercially in the United States: digging sticky, black, tar-soaked sand from the ground and extracting the petroleum. (AP Photo/Rick Bowmer)
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