Five years ago this month, the firm TransCanada submitted a permit request to build the Keystone XL oil pipeline, which would bring tar sands oil from Canada to refineries on the Gulf Coast. The project has sparked one of the nation's most contentious environmental battles in decades. The Obama administration initially appeared ready to approve Keystone XL, but an unprecedented wave of activism from environmentalists and residents of the states along its path has forced several delays. Among those pressuring Obama for Keystone XL's approval is the Canadian government, which recently offered a greater pledge of reduced carbon emissions if the pipeline is built.
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