section_heading: Klimatske promjene
paragraph_text: Za klimatske promjene posebno su kritična ležišta metanskih klatrata u permafrostu. Istraživanja 2008. godine u arktičkom dijelu Sibira, su pokazala da su se milijuni tona metana oslobodili iz permafrosta, jer su mjerenja pokazala da su koncentracije metana do 100 puta veće od normalnih.<ref>Methane bubbling through seafloor creates undersea hills, Monterey Bay Aquarium Research Institute, 2007.<ref> Translation of a blog entry by Örjan Gustafsson, expedition research leader, 2008.<ref>N. Shakhova, I. Semiletov, A. Salyuk, D. Kosmach, and N. Bel’cheva (2007), Methane release on the Arctic East Siberian shelf, Geophysical Research Abstracts,<ref>N. Shakhova, I. Semiletov, A. Salyuk, D. Kosmach (2008), "Anomalies of methane in the atmosphere over the East Siberian shelf: Is there any sign of methane leakage from shallow shelf hydrates?," European Geophysical Union, 2008.<ref> Volker Mrasek,  "A Storehouse of Greenhouse Gases Is Opening in Siberia", Der Spiegel, 2008.<ref>  "Exclusive: The methane time bomb" Connor Steve, 2008., publisher=The Independent<ref>  "Hundreds of methane 'plumes' discovered", Connor Steve, 2008., publisher=The Independent