Why worry about methane seeping up through Alaska tundra?

Alaska Dispatch: As people watch the decline of Arctic sea ice, the most obvious sign of climate warming in that region, scientists are noting other signs of change, like methane seeping out of the ground as permafrost thaws and glaciers melt across the Arctic. Scientists suspected these methane seeps existed, but no one had measured how much methane was escaping -- until recently. After working for nearly 10 years on the ground studying Siberian lakes, Katey Walter Anthony, an aquatic ecosystem ecologist at the......

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