Frozen Carbon

This is a polar map of permafrost extent in the Northern Hemisphere. A sidebar explains how permafrost, as it forms and later thaws, serves as both a sink and source for carbon to the atmosphere. Related multimedia is a slideshow of permafrost scientists from U. of Alaska, Fairbanks, collecting permafrost data in the field.

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Jonathan Corum
New York Times

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Teaching Tips

Teaching Tips

Use with National Snow and Ice Data Center (NSIDC) website for much more extensive information on permafrost.

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