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Supertopics:
Sources of Carbon Dioxide Emissions
Melting Permafrost Is Releasing Global Warming Gases

Melting Permafrost Releasing Carbon Dioxide

Documents:
melting permafrost is feeding cliamte change
webScienceDaily2015-04-23
melting permafrost may release much CO2
webKeay DavidsonSan Francisco Chronicle2006-06-16