Pieces of ice fall from the Perito Moreno glacier in Argentina, December 16, 2009.
Marcos Brindicci / Reuters

Climate has always influenced human affairs. There are now increasing signs that man may in turn be altering global climate. This could change economic, political and even military relations among nations.

Climate drives agricultural and forest production, and it largely governs the way people live and work. Unexplained natural climatic variation has characterized all of human history and prehistory. Many climatologists now believe that in the present advanced stage of industrialization the addition of carbon dioxide and particulate matter to the atmosphere through burning of fossil fuels and clearing of land has become a significant agent of climatic change that

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