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The Search for Clean Air
 This program presents a clear, forceful, and thorough exposition of the problems of air pollution: its causes; its effects on forests, streams, and human health; and the issues involved in correcting the problems. Narrated by Walter Cronkite, the pro...(more details) |
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$169.95 |
| DVD + 3-Year Streaming |
$254.93 |
| 3-Year Streaming |
$169.95 |
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The Environment: A Historical Perspective
 From the first agricultural settlements, to the industrial revolution, to agribusiness and widespread urbanization, humans have been transforming the environment for thousands of years. But now, with rain forests disappearing at an appalling rate, po...(more details) |
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| DVD |
$79.95 |
| DVD + 3-Year Streaming |
$119.93 |
| 3-Year Streaming |
$79.95 |
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The Last Drop: Is the World Running Out of Water?
 Water shortages contribute to many regional conflicts worldwide. Only two-and-a-half percent is fresh, and it is therefore a precious commodity. This documentary illustrates how the worsening problem of global water shortage leads to regional politic...(more details) |
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| DVD |
$169.95 |
| DVD + 3-Year Streaming |
$254.93 |
| 3-Year Streaming |
$169.95 |
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The Fallacy of Global Warming
 Have two centuries of industrialization caused an increase in global warming? In this comprehensive program, experts analyze satellite images, archival weather records, tree rings, core samples from the ocean floor, and air frozen into ancient ice to...(more details) |
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| DVD |
$149.95 |
| DVD + 3-Year Streaming |
$224.93 |
| 3-Year Streaming |
$149.95 |
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Alternative Power Sources and Renewable Energy
 This program demonstrates how wind turbines, solar cells, hybrid automobiles, and coal gasification plants are beginning to transform the way the world is powered. The U.S. Secretary of Energy, the director of the National Wind Technology Center, the...(more details) |
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| DVD |
$129.95 |
| DVD + 3-Year Streaming |
$149.93 |
| 3-Year Streaming |
$129.95 |
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