Author(s): Robert E. Wells
Format: Hardback
No. of Pages: 32
Publisher: Albert Whitman & Company
Language: English
Date Published: 2008-10-31
Dimensions: 177 x 266 x 8mm
Publication City/Country: Morton Grove, United States
Edition:
Illustrations:

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.