Canada currently possesses ~173 billion barrels of recoverable oil from tar sands. Let's assume that all of this oil can be recovered by the proposed Keystone XL pipeline. This pipeline is expected to provide approximately 255 million barrels of additional oil to the U.S. per year. Using the calculations you did and other information provided in the fossil fuel lab as a guide, state whether you think this is an effective long-term energy fix for the United States (you should back up your answers with calculations)