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Biologist comments on a startling new finding in climate change research

The steady march of global warming over the past century has led to the thawing of permafrost—a layer of subsurface soil in the Arctic that usually remains frozen year-round. While that's troubling for local ecosystems, it could have disastrous global impacts as well. As this permafrost melts, it sets off a biochemical chain reaction in the soil that could dramatically increase the emission of greenhouse gases into the atmosphere, accelerating further climate change.
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