Carbon Footprint of Canada's Oil Sands Is Larger Than Thought

InsideClimate News : "Tar sands crude carried by Line 67 would have a carbon footprint of 632 kilograms per barrel, the GREET model estimated. That compares to an average U.S. refinery mix of 521 kilograms per barrel of carbon dioxide emissions. The difference is 111 kilograms per barrel—21 percent dirtier, not 17 percent."