When I last did some work in the high Arctic, there was a lot of concern about the release of methane as tbe permafrost thawed.
http://www.washingtonpost.com/national/health-science/as-the-earth-warms-forest-floors-add-greenhouse-gases-to-the-air/2012/06/11/gJQATcIOVV_story.html?wpisrc=nl_headlines_Tue Ed
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