Construction of the 1,700-mile-long pipeline, which would ship carbon-intensive tar-sands oil from Canada to the Gulf Coast, is awaiting approval from the U.S. State Department. The president's position on it has never been clear. Sold as a way to keep oil prices low, the pipeline mostly perpetuates dependence on fossil fuels and does nothing for energy security (most of the oil would be sold on the global market). A better solution: Keep boosting vehicle fuel efficiency standards and kill the pipeline.