Orbitally triggered decomposition of soil organic carbon in terrestrial permafrost is suggested as an explanation for a series of sudden and extreme global warming events that occurred about 55 million years ago.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/past-extreme-warming-events-linked-massive-carbon-release-thawing-permafrost
[2] http://admin.indiaenvironmentportal.org.in/category/author/robert-m-deconto
[3] http://admin.indiaenvironmentportal.org.in/category/author/simone-galeotti
[4] http://admin.indiaenvironmentportal.org.in/category/author/mark-pagani-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/italy
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases