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Only in the last century have we begun to observe the global ocean/atmosphere system in enough detail to discern the geographical patterns of climatic change. Man is undoubtedly influencing the global climate; certainly several products of his activity (smog, dust, and heat pollution) will be more influential in a few decades, if they are not controlled. Specific cause and effect estimates are still very uncertain in this respect. On the other hand, it does appear to be within man's engineering capacity to influence the global system by altering patterns of thermal forcing. There have been specific proposals made for improving climatic resources of particular regions. Viewing the results of computer technology and simulation models used thus far in weather modification studies, it is significant that we are reaching, or perhaps have already reached, a technological threshold from which progress can be proportional to the investment of effort.

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