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Not-so-permafrost

Methane is already bubbling up as the Arctic thaws

Methane bubbles up from the thawed permafrost at the bottom of the thermokarst lake through the ice at its surface.
Methane bubbles up from the thawed permafrost at the bottom of the thermokarst lake through the ice at its surface. Credit: Katey Walter Anthony/ University of Alaska Fairbanks