Arctic sea "foaming" with methane?

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An article in The Independent reports on a new scientific discovery that massive amounts of a greenhouse gas are spewing into the atmosphere from beneath the Arctic sea. Over at WorldChanging, Alex Steffen puts it into context, opening with the line that this discovery, if confirmed, "is really, really, really bad news." "An Arctic Sea 'Foaming' with Methane: What Now?" (WorldChanging),
Exclusive: The Methane Timebomb (The Independent)