Arizona Republic: Colorado River water users will experience frequent shortages in the coming years as warmer, drier conditions squeeze an already overburdened resource, scientists said Monday. Even without the effects of climate change, the scientists warned that the river may not produce as much water from mountain snowmelt as it did when the flow was divided among seven states in the early 1900s, some of the wettest years in centuries. The result in either case would be tough choices among …