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A large section of the controversial Keystone XL pipeline was officially put to work Wednesday, in a move that supporters say will help ease the flow of oil to refineries. The Obama administration has yet to rule on the project's northern portion.
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Five years ago, a Canadian company proposed building the Keystone XL pipeline to connect Canada's tar sands oil development with the big U.S. refineries on the Gulf Coast. The southern stretch of this pipeline is nearly finished, but the northern stretch is still under study.