Associated Press: Climate change and a growing demand for water could drain two of the nation’s largest man-made reservoirs within 13 years, depriving several Southwestern states of key water sources, scientists warn. Researchers at San Diego’s Scripps Institution of Oceanography said Wednesday that there’s a 50 percent chance that lakes Mead and Powell will dry up by 2021, and a 10 percent chance the lakes will run out of usable water by 2013. “We were surprised that it was so soon,” …