Experts weigh in on the problem of positive feedback loops affecting Earth's melting cryosphere. Location footage and computer graphics support discussions including changes to Arctic and Antarctic ice and snow, factors (including albedo) that make the Arctic especially sensitive, melting glaciers and ice sheets (and sea level rise), and thawing permafrost. A teacher's guide is accessible to computer users. Grades 7–12. Closed captioned. Color. 30 minutes. Ambrose. ©2008.
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