title: Keystone XL.
authors.affiliation: Marcia McNutt is Editor-in-Chief of Science.
authors.forename: Marcia
authors.initials: M
authors.lastname: McNutt
mesh_terms: D002170:Canada; D003247:Conservation of Natural Resources; D019652:Extraction and Processing Industry; D005579:Fossil Fuels; D010578:Petroleum; D059205:Renewable Energy; D014481:United States
chemical_list: D005579:Fossil Fuels; D010578:Petroleum