Grist: Like a towheaded baby whose golden curls inevitably turn mousy brown at exactly the same age he or she starts giving a crap about hair color, our planet is going darker on top as it ages. Thats bad news for a couple of reasons first, because its happening as a result of global warming, and second, because it will make global warming worse. Scientists analyzed 30 years of data and discovered that the Arctic is losing some of its reflectivity i.e., its getting darker. Thats because of thinning...