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Polar Bear, Why Is Your World Melting? (edition 2008)
by Robert E. Wells, Robert E. Wells (Illustrator)
Polar Bear, Why Is Your World Melting? by Robert E. Wells
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Amazon.com Product Description (ISBN 0807565997, Paperback)In the Arctic, the summer ice is melting, making it hard for polar bears to survive. Why is the world getting warmer? The heat of the sun is trapped by the "greenhouse" gases that surround Earth--carbon dioxide, methane, nitrous oxide, and water vapor.
(retrieved from Amazon Mon, 30 Sep 2013 13:49:31 -0400)
Learn why the Earth is heating up and threatening the polar bears.
(summary from another edition)
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