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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, temperatures appear to be rising, with foreseeably disastrous consequences. The gases in the air which cause the greenhouse effect have made life possible; too many gases, however, and catastrophe looms. Observation, historical records, and computer models lead to the conclusion that temperatures are rising, though no one can be certain how high they will go, or when, or what will happen. Low-lying areas will be under water, of course, as ice melts and sea levels rise; diseases and predators will proliferate; rains will increase in some parts of the world, while drought strikes elsewhere and mass starvation results. (26 minutes)



 
                

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Copyright date: ©1990



Part of the Series : Climate and Man
     


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Acid Rain
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An explanation of the history of acid rain and the dangers posed by industrial carbon and sulfur emanations that interact with airborne moisture to produce acid rain, the program provides chemical definitions, illustrates geological and meteorologica...(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)
 
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)
 
Danger Ahead: Is There No Way Out?
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If the threat of global warming has been created by our reckless use of technology, can we use technology to eliminate the threat? We could try to cool the earth by deliberately polluting the atmosphere, as volcanoes do, but suppose we overcooled the...(more details)
 


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