New York Times: The Colorado River is a critical source of water for seven Western states, each of which gets an annual allotment according to a system that has sparked conflict and controversy for decades. But in an era of climate change, even greater difficulties loom. The scope of those potential problems is detailed in a study being published in The Proceedings of the National Academy of Sciences. Tim P. Barnett and David W. Pierce of the Scripps Institution of Oceanography report that under …