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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.
Subject: Environmental Science:Global Change and Climate, Geoscience:Atmospheric Science:Climatology , Biology:Biogeochemistry Grade Level: College Lower (13-14), High School (9-12), Middle (6-8) Theme: Teach the Earth:Course Topics:Environmental Science, Biogeoscience, Atmospheric Science, Teach the Earth:Incorporating Societal Issues:Climate Change