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.
Source: http://www.npr.org/2013/09/16/222958546/climate-change-concerns-slows-debate-over-keystone-xl-pipeline?ft=1&f=1007
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