"The fight over Keystone XL has fired up the climate movement more than any other cause of the last few years. And with good reason: according to our nation’s top climate scientist, NASA’s Dr. James Hansen, fully developing the Canadian tar sands would mean “essentially game over” for the climate. As 350.org founder Bill McKibben has said, “Keystone XL is the fuse to the largest carbon bomb on the planet.”
Where does Canada currently stand on developing the tar sands? If I recall correctly, if Keystone XL isn't built Canada's Prime Minister Stephen Harper has said he will simply build a pipeline to Vancouver and ship oil to China. Either way, bad news for climate.
The real issue is not developing the sands. If they are going to develop, would we rather the oil be refined in the US or China? There are no great options here.