Bloomberg: Even if you havent been following the saga of the proposed Keystone XL pipeline, and havent decided if its a fast track to U.S. energy independence (those in favor) or game over for human civilization (those opposed, because of its role in climate change), yesterdays developments are too rich to ignore. In fact, it may be game over for the Keystone XLat least until 2016thanks, once again, to U.S. State Department oversight. First, a refresher: Because the proposed line crosses the Canada-U.S....