Fewer Trees Mean Global Warming But So Do More Trees

Scientists know that rain forests play a role in setting the earth's temperature. Cutting them down can cause global warming. But jungles aren't the only forests that affect climate. In a study in the Oct. 22 issue of Nature, climatologist Gordon B. Bonan and colleagues at the National Center for Atmospheric Research report that the vast boreal forests stretching around the northern part of the world can boost--you heard it right--global warming.

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