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.
Robert E. Wells is the author and illustrator of many intriguing and award-winning science books for children, including Can You Count to a Googol? and Why Do Elephants Need the Sun? He lives with his wife in Wenatchee, Washington.
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