Scientists have identified thousands of sites in the Arctic where methane that has been stored for many millennia is bubbling into the atmosphere.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/arctic-melt-releasing-ancient-methane-0
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/new-age-bangladesh
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/scientists
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arctic
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/glacial-melt
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/methane
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/alaska
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/greenland
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lakes