Scientists took sonar measurements to record clouds of methane bubbles rising from the seafloor. Photo: Igor Semiletov, University of Alaska

More evidence is emerging that methane previously trapped in the permafrost below the Arctic sea is starting to be released into the oceans and potentially into the atmosphere. Research published in Science shows that up to 7 million tons of methane is released annually from the East Siberian...Read the full story on TreeHugger