In the Arctic, the summer ice is melting, making it hard for polar bears and their cubs to survive. Why is the world getting warmer? In simple language, Wells explains why so much carbon dioxide is going into the air and what can be done to help keep Earth cool. Full color.
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.