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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 the search for food; during ice ages, when sea levels dropped, new areas became accessible and populations spread. Links between climatic changes and emerging civilizations have also been postulated; the collapse of civilizations confronted with climatic challenges to which they could not or would not adapt is clearly documented: the Indus River civilization, the Viking settlement in Greenland, even the French Revolution. And Hitler’s disastrous decision to invade Russia in 1941 was apparently based on inaccurate weather forecasting! (26 minutes)



 
                    

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Copyright date: ©1990



Part of the Series : Climate and Man
     


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The Return of the Child: The Effects of "El Nino"

This program charts the birth and development of the weather system "El Nino," so-called because it occurs at the time Christmas is celebrated. The most severe El Nino on record was first noticed in 1982. In Peru, the fishing water was 15 degrees abo...(more details)
 
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)
 
Modifying the Weather: The Case of the Man-Made Desert
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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 c...(more details)
 


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