Nature: The proposed Keystone XL oil pipeline could significantly increase greenhouse-gas emissions, suggests an analysis published on 10 June in Nature Climate Change1.
The pipeline would carry as many as 830,000 barrels of crude oil per day from the tar sands of western Canada to the midwestern United States, where it would connect to existing pipelines that run to the Gulf of Mexico. The economic model used in the study suggests that this additional supply would lower oil prices and drive consumption,...