New research from UC Merced and the Union of Concerned Scientists finds that 122 major oil, gas, coal, and cement producers are responsible for about 40% of the snowpack decline across the Western U.S. since 1950. That translates to annual water losses equivalent to a full Lake Mead, plus reduced streamflows and higher irrigation demands. The study uses attribution science to isolate the specific contribution of these companies to the region's worsening water crisis. Beyond the numbers, the paper strengthens the case for holding large emitters financially accountable. States like New York and Vermont already passed climate superfund laws, and this evidence could accelerate similar legislation. It also highlights why cutting emissions at the source remains the most direct way to protect water supplies in the West.
