Keystone Xl Pipeline
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Sen. John Hoeven, Republican of North Dakota, complained about "another obstructive tactic" over the Keystone XL pipeline. (Associated Press)

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**FILE** Demonstrators outside the White House march in November with a replica of a pipeline during a protest of the planned Keystone XL pipeline that would bring tar sands oil from Canada to Texas. (Associated Press)

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Demonstrators march with a replica pipeline outside the White House on Sunday to protest TransCanada's proposed Keystone XL pipeline. Citing environmental fears, the State Department on Thursday ordered a new review of the Canada-to-Texas pipeline. (Associated Press)

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Mike Tidwell (right) from the Chesapeake Climate Action Network addresses a rally outside the Ronald Reagan Building in Washington on Oct., 7, 2011, against the proposed Keystone XL pipeline. (Associated Press)

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** FILE ** Environmental activists gather outside the White House on Monday, Aug. 22, 2011, to protest the Keystone XL pipeline. (Associated Press)

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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)