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Arctic seafloor a big source of methane

Sediments had been thought to be capped by subsea permafrost

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1:43pm, March 4, 2010

Prodigious plumes of planet-warming methane are bubbling from sediments across a broad region of Arctic seafloor previously thought to be sealed by permafrost, new analyses indicate. The resulting increase of methane gas in the atmosphere may accelerate climate warming, scientists say.

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