The U.S. State Department approved a controversial pipeline project today that, once built, will carry tar sands oil from Alberta, Canada, into the northern United States. 

Environmental groups and Native Americans who have been fighting the Alberta Clipper pipeline plan are already preparing a legal challenge. 

In Canada, meanwhile, the Beaver Lake Cree Nation is going after the government and major oil producers in a fight for its rights under an 1876 treaty to hunt, fish and trap animals on the same land that is being stripped away for tar sands production.

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