Thursday, May 10, 2007

causes of global warming


There are two main causes for global warming the firs one is natural causes is a release of methane gas from arctic tundra and wetlands. Methane is a greenhouse gas. A greenhouse gas is a gas that traps heat in the earth's atmosphere and the earth in a cycle of climate change. The other causes are made by the human’s Pollution made by the increase of using carbon dioxide.

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