Evidence of man-made climate change

Cloud seeding to produce additional snow water content in the snowpack of the Upper South Platte and Arkansas River Basins in Colorado is explained. Detailed meteorological and physics of cloud characteristics for cloud seeding are descried. Evaluation is based on statistical methods, using a 10 year period of snow surveys water content data prior to seeding and comparing the 3 years of seeding data of snow surveys conducted during this period. Claims are made that seeding increased the snowpack by 200% over the basic 10 years, while other basins to the south along the Rocky Mountains did not show this increase during the seeding of the last 3 years. Charts illustrate the 3 years of seeding operations and location of river basin target areas. In discussion Milton S. Sachs points out that good results are shown in increasing the snowpack by cloud seeding in the northwest along the Cascades and Rockies. He states that large scale operations are more affective and not so difficult to evaluate.