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http://e-rse.net/climat-bombe-methane...uffement-climatique-23394/#gs.=l2qjFQ
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http://siberiantimes.com/ecology/case...king-methane-200-times-above-the-norm
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http://www.futura-sciences.com/videos...auffement-climatique-3142/#xtor=AL-27
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http://phys.org/news/2015-02-craters-siberia.html
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