Unfortunately, California (and the American West) have experienced droughts on the order of decades or centuries, and in the fairly recent past. So it could ge

Unfortunately, California (and the American West) have experienced droughts on the order of decades or centuries, and in the fairly recent past. So it could get so much worse: http://www.ldeo.columbia.edu/res/div/ocp/drought/medieval.shtml http://www.ldeo.columbia.edu/res/div/ocp/drought/medieval.sh...