Inter Press Service: The frozen cap trapping billions of tonnes of methane under the cold waters of the Arctic Ocean is leaking and venting the powerful greenhouse gas into the atmosphere, new research shows. It is not known if this may be one of the first indicators of a feedback loop accelerating global warming. Researchers estimate that eight million tonnes in annual methane emissions are being released from the shallow East Siberian Arctic Shelf, which is equivalent to all the methane released …