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Members of the Cowboy and Indian Alliance (CIA), a group of ranchers, farmers and indigenous leaders hold signs during a protest against the Keystone XL pipeline on the National Mall in Washington, D.C., U.S., on Tuesday, April 22, 2014. TransCanada Corp. is awaiting a U.S. permit to build the northern leg of Keystone XL, which would supply U.S. Gulf Coast refineries with crude from Alberta's oil sands. Because it crosses an international boundary, the proposal requires State Department approval. Photographer: Pete Marovich/Bloomberg via Getty Images,WASHINGTON, DC - AUGUST 12:  Activists stage a sit-in and protest against the Keystone XL pipeline outside the U.S. State Department August 12, 2013 in Washington, DC. Activists from the Rainforest Action Network, CREDO and other groups expressed their opposition to the Keystone XL pipeline and urged "to maintain pressure on the president to keep his promise to fight climate change by rejecting the Keystone XL pipeline."  (Photo by Alex Wong/Getty Images) Getty