Methane is a greenhouse gas more than 30 times more potent than carbon dioxide. It is released from previously frozen soils in two ways. When the organic material -- which contains carbon -- stored in permafrost thaws, it begins to decompose and, under oxygen-free conditions, gradually release methane. Methane can also be stored in the seabed as methane gas or methane hydrates and then released as subsea permafrost thaws. These releases can be larger and more abrupt than those that result from decomposition.
From Science Daily March 5 2010,from Science March 5 2010
http://tempsreel.nouvelobs.com/actualites/sciences/nature/20100305.OBS8828/le_methane_sechappe_de_locean_arctique_plus_rapidement_.html
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