Associated Press: Changes in climate and strong demand for Colorado River water could drain Lake Mead by 2021, triggering severe shortages across the region, scientists warn. Researchers at San Diego’s Scripps Institution of Oceanography said Tuesday the West’s largest storage reservoir faces increasing threats from human-induced climate change, growing populations and natural forces like drought and evaporation. There is a 50 percent chance Lake Mead will run dry by 2021 and a 10 percent chance …