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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 |
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$169.95 |
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$254.93 |
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$169.95 |
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Waste Disposal
 Household waste can cause pollution of all kinds, but more and more of these wastes can be recycled effectively and economically. The result is reduced pollution and a useful new source of raw materials and energy. Hospital waste disposal presents th...(more details) |
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$99.95 |
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$99.95 |
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$149.93 |
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$99.95 |
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Principles of Ecology
The principles of ecology establish the relationships that interconnect humans as a biological species with each other and with their environment. This program also considers the Gaia Hypothesis and the view of the planetary ecosystem as a gigantic l...(more details) |
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Fragile Ecosystems
This program looks at three fragile ecosystems, all in danger of destruction from human activity: marshes, the implication of whose destruction on wildlife, water tables, and an increasing number of other aspects of the entire biosphere is only begin...(more details) |
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Fighting Pollution
The war on pollution in all its forms is a pressing priority that brooks no delay. Although much remains to be done, the technology to restore our environment is already in existence. This program describes three examples of such technology: the puri...(more details) |
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