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a <br /> EXHIBIT K <br /> WWC-Vail/Beaver Creek <br /> BuSto, Joe Record of Decision <br /> Vail Public Library-Public Hearing <br /> From: Saved by Windows Internet Explorer 7 September 212010 <br /> Sent: Monday,July 23, 2007 12:14 PM <br /> Subject: Planned and Inadvertent Weather Modification <br /> Planned and Inadvertent Weather Modification <br /> A Policy Statement of the American Meteorological Society as adopted by the Council on 5 January 1992 <br /> Contents <br /> 1. Introduction <br /> 2. Status of planned weather modification <br /> 3. Status of inadvertent weather modification <br /> 4. Environmental and societal imMacts of weather modification <br /> 5. Recommendations <br /> 1. Introduction <br /> Humans modify the weather deliberately and unintentionally; this is well founded in both theory and <br /> observations. Evidence accumulated over the last 40 years suggests that certain local weather conditions <br /> including fogs, low clouds, and precipitation in some areas can be altered by carefully controlled cloud seeding. <br /> Similarly,the effects of inadvertent weather modification are becoming better understood. Cities and industrial <br /> complexes affect local weather conditions and alter precipitation. Regional weather changes result from other <br /> human activities such as deforestation and vehicle traffic on major transportation corridors. The focus of this <br /> statement is limited to local and regional changes and is mainly concerned with the scientific background to the <br /> problem. The Society's policy on global climate change is separate and has previously been presented(Bull. <br /> Amer. Meteor. Soc., 72, 57). <br /> Early cloud seeding efforts, conducted in the 1940s and 1950s,involved attempts through field operations to <br /> increase precipitation without a sound scientific foundation. Most early scientific cloud seeding experiments <br /> were designed,conducted, and evaluated on the premise that statistical analyses of one or more variables <br /> (primarily precipitation)would yield statistically significant and scientifically acceptable results. Data from <br /> many experimental seasons were often required to achieve sufficient numbers of test cases. Results of such <br /> experiments have been mixed, some showing increases, some decreases,and many no statistically significant <br /> changes. Most of these experiments lacked supporting physical documentation as to how precipitation <br /> increases, if any, were achieved. In addition, the lack of clear cut replication of the more successful cloud <br /> experiments has diminished their credibility and value. Thus, satisfactory determination of the capabilities of <br /> cloud seeding to produce desired effects under various conditions has not resulted from the statistical analyses. <br /> i <br />