This article and slide show from the New York Times, features several scientists from the University of Alaska, Fairbanks, who study the effects of thawing permafrost in Alaska.
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Article, graphic and slideshow print well if hard copies needed.
Article is entitled "As Permafrost Thaws, Scientists Study the Risks"; slide show entitled "Hunting for Clues to Global Warming"
related graphic shows the extent of permafrost in the Northern hemisphere
Science focuses on the release of methane from decaying organic matter that thaws as the surrounding permafrost thaws, due to rising surface temperatures. Other related effects of thawing permafrost are mentioned as well.
Passed initial science review - expert science review pending.
The slide show, article, and graphic provided can easily be used in a unit/lesson on the carbon cycle and climate change, or a geography lesson/unit that includes the Arctic.