Summary: 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...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2006
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Summary: They are now banned worldwide-but the toxins known as PCBs are not going away. This program explains how the compounds have almost irreparably polluted the globe and still threaten future generations. The film begins in 1927, when PCBs became integral to electric power and, eventually, a vast array of agricultural and technological products. Describing the growth of scientific awareness of...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2006