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TransCanada's $7 billion Keystone XL pipeline is designed to carry crude oil from tar sands near Hardisty, Alberta, to the Gulf Coast. It must first receive approval through the U.S. State Department's permitting process, but it has been stuck there for three years in part because of environmental concerns. (Associated Press)

TransCanada's $7 billion Keystone XL pipeline is designed to carry crude oil from tar sands near Hardisty, Alberta, to the Gulf Coast. It must first receive approval through the U.S. State Department's permitting process, but it has been stuck there for three years in part because of environmental concerns. (Associated Press)

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