Between droughts and floods, the last decade has offered water managers in the southwest a preview of how climate change could impact a supply largely dependent on winter snow. This year’s disappointing snowpack has them worried again. “Water and climate change are joined at the hip,” said Brad Udall, a researcher at Colorado State University who published a paper earlier this year showing how climate change has reduced flows in the Colorado River. “One of the primary impacts of a warming atmosphere are changes to our water cycle.”