Here we present a regional, multivariable climate-change detection and attribution study, using a high-resolution hydrologic model forced by global climate models, focusing on the changes that have already affected this primarily arid region with a large and growing population. The results show up to 60% of the climate related trends of river flow, winter air temperature and snow pack between 1950-1999 are human-induced.
These results are robust to perturbation of study variates and methods. They portend, in conjunction with previous work, a coming crisis in water supply for the western United States.
Full Report: http://www.matr.net/files/Science-20Western20Water1.pdf
(Many thanks to Steven Running for passing this along. You can hear an interview on climate change with Dr. Running here. http://matr.net/article-27819.html
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Montana Chamber Climate Change Conference Registration, Billings-3/19/08 http://www.montanachamber.net/admin/sites/513/filelib//Climate%20Change%20Conference%20_2_.pdf