Globe And Mail: Michael Byers holds the Canada Research Chair in Global Politics and International Law at the University of British Columbia. He is the author of International Law and the Arctic, which was awarded the Donner Prize in 2014. Eighty-three billion barrels: Thats how much oil could be present in the Arctic, according to a high-profile U.S. geological survey report released in 2008. But the wave of excitement from the report is now receding, as some harsh realities sink in. First, 83 billion barrels...