We use cookies to run the site and, with your permission, to measure how it is used. You can accept all of them or deny the ones that are not needed. Read the cookie policy.
⭐ Ratings & Reviews
No reviews yet — be the first!
No reviews yet.
📖 Description
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.
