Freshwater is in more demand as population and wealth increase. Global warming will bring more precipitation, but precipitation in forms that current technology may not be able to capture as freshwater efficiently. As the climate warms, more water will fall as rain rather than as snow. Reservoirs should fill earlier as the lesser amount of snow melts sooner, and the timing and amounts of run-off will be altered–timing and amounts that we currently count on. Of course, technology will adjust to offset this. And, geographic patterns of precipitation may change, further complicating matters.