Washington Post: Not long ago, scientists at NASA and two major universities warned of an inevitable megadrought that will parch the southwestern United States for 35 years, starting around 2050. By then, a new study says, Californians should be fairly accustomed to long, harsh and dry conditions. Over the past 15 years, temperatures have been rising in the Golden State, resulting in annual periods of extreme and blazing heat, while the cycle of low and moderate precipitation cycles have not changed since 1977....