
Part of the Wells of Knowledge Science series
Melting Arctic ice threatens polar bears as greenhouse gases warm the Earth.
As Arctic ice vanishes, polar bears struggle to survive in a warming world. Discover the mystery behind Earth's rising temperatures and the greenhouse gases trapping the sun's heat. Can we reverse the damage?
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.
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