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By building roads, watering crops, and grazing cattle, we are constantly changing the climate. We may also modify the weather by cloud seeding, though there is no scientifically accepted proof that rain or snow would not have occurred naturally in cases where seeding appears to have been successful. This program shows how migration in the Sahel has altered regional climate; examines the tomorrow-be-damned policy of water usage in Arizona; and investigates the drastic miscarriage of good intentions in Central Asia, where efforts to irrigate the desert turned into the worst climatic disaster in the history of the Soviet Union: the drying up of the Aral Sea, once the world’s fourth-largest lake. The program details how this catastrophe happened and reveals its consequences for the population, the physical geography, and the climate of the area. (26 minutes)



 
                

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Copyright date: ©1990



Part of the Series : Climate and Man
     


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The Greenhouse Effect
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A life-sustaining envelope of gas surrounds the earth. This atmosphere contains oxygen, CO2, water vapor, and other gases-it is what generates climate, which affects all living beings. This program analyzes the sun's gradual brightening and the relat...(more details)
 
Sun, Sunlight, and Weather Patterns
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Climate is a changing phenomenon, the first signs of alteration appearing in its day-to-day behavior-i.e., the weather. One readily observable recent climatic change is the increase in the number and ferocity of giant weather events like hurricanes. ...(more details)
 
Global Warming
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The history of Earth has been a history of temperature change; people and animals have historically moved to better climes, richer pastures, and areas of more abundant food. The problem now is that "somewhere else" is already occupied; meanwhile, tem...(more details)
 
Coastlines

They appear like permanent lines on maps, but coastlines are in constant flux, eaten away by erosion and extended by deposits of sand and stone carried by water. This program looks at the vegetation that is gradually established; at the continental s...(more details)
 
Civilization and Climate
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Changing climate probably played the decisive role in drawing hominids out of the trees, up on their hind legs, and off in search of food whose supply had been dispersed by the replacement of rainforests by grasslands. Migrations were motivated by th...(more details)
 


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