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The fascinating story of beavers in North America - their history, their near extinction, and their current comeback, as a growing number of scientists, conservationists and grass-roots environmentalists have come to regard beavers as overlooked tools when it comes to reversing the disastrous effects of global warming and world-wide water shortages. Narrated by Brian Unger. 60 minutes. Widescreen. Please note that this DVD may not play on a Blu-ray player.