Columbia University researchers warned in April that the western United States might be entering a 20-year mega-drought. Human-caused climate change is one reason. And drought is an even bigger problem in places that have uneven access to water in the first place. In the Navajo Nation in the Southwest, numbers vary but between 15% and a third of the population have no running water or access to clean drinking water. The need has been even greater during the coronavirus pandemic because people need more water for hand-washing and sanitation to stop the spread.