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Arctic permafrost is now a net source of major greenhouse gases
Global Warming’s New Threat: Arctic Permafrost’s Carbon Bomb
Sea of methane sealed beneath Arctic permafrost could trigger climate feedback loop if it escapes
Arctic Permafrost Hides Migrating Methane That Could Skyrocket Emissions
The Arctic permafrost is 1,000 years old. As it thaws, the Pentagon worries what it might unleash
