Mongabay: Climate change is already impacting water supplies in the western United States and is likely to reducer carbon sequestration by regional ecosystems, reports research presented at the fall meeting of the American Geophysical Union in San Francisco. A study led by researchers at Scripps Institution of Oceanography reports that "trends in snowpack, river runoff, and air temperatures – three fundamental indicators of the status of the West’s hydrological cycle – point to a decline …