Polar Bear, Why Is Your World Melting? pdf epub mobi txt 電子書下載 2024

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Wells, Robert E./ Wells, Robert E. (ILT)

2008-10

51.00元

9780807565995

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发表于2024-11-21

Polar Bear, Why Is Your World Melting? epub 下載 mobi 下載 pdf 下載 txt 電子書下載 2024

Polar Bear, Why Is Your World Melting? pdf epub mobi txt 電子書下載 2024

圖書描述

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? The heat of the sun is trapped by the "greenhouse" gases that surround Earth--carbon dioxide, methane, nitrous oxide, and water vapor. If there is just the right amount of these trapped gases, the air is warm enough for plants, animals, and people to thrive. But now there is too much greenhouse gas, especially carbon dioxide. Polar bears, and all of us, are in trouble. Robert E. Wells, who lives in Washington State, shows why so much carbon dioxide is going into the air and what we can do to help keep Earth cool.

Polar Bear, Why Is Your World Melting? 下載 mobi epub pdf txt 電子書