Climate Central: If it is ever built, the Keystone XL Pipeline will exist for one reason: To move Canadian tar sands oil from remote Alberta to refineries in Texas.
For the U.S., controversy over the tar sands is about Keystone XL Pipeline construction jobs, local environmental problems with the pipeline, carbon emissions and the political stability brought by burning North American crude oil, which means importing less of it from overseas.
For Canada, the story of the tar sands' future hinges on the great...