Grist: At times, I become really, really curious about the Barack Obama we`re going to see once he`s done being president. He has a gift for talking about complex and unpleasant issues - one that has, for the most part, been submerged by political expediency, but that still pokes through occasionally. This interview with The Economist, conducted on Air Force One by John Micklethwait and Edward Carr, is one such occasion - and offers some encouraging signals about his administration`s approach to climate...