Texas Tribune: Climate change is taking a toll on Texas, and the devastating floods that have killed at least 15 people and left 12 others missing across the state are some of the best evidence yet of that phenomenon, state climatologist John Nielsen-Gammon said in an interview Wednesday. "We have observed an increase of heavy rain events, at least in the South-Central United States, including Texas," said Nielsen-Gammon, who was appointed by former Gov. George W. Bush in 2000. "And it's consistent with what...