In considering the modification of weather, two obvious (but easily underemphasized) necessities are: (1) to set forth clearly and completely the nature of the need that is being filled; and (2) to align planning with forecasting. An illustration is given of situations in which augmentation of rainfall would and would not be prudent. Another illustration shows that actually controlling the weather would differ in utility from merely precipitating a larger fraction of water from clouds than nature would. 12 pp. Bibliog.
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