Sat, May

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Researchers from Stockholm University on the icebreaker Oden in the Arctic Ocean reported from the site that "vast methane plumes" were rising from the ocean floor probably due to a tongue of warmer Atlantic water that is penetrating into the Arctic.

The observation shocked the scientists on board who issued a press release. A recent news story on the Oden's mission also reflected their strong concerns.

Meanwhile, a crater spotted in the frozen Yamal peninsula in Siberia earlier this month was probably caused by methane released as permafrost thawed due to higher temperatures, researchers in Russia say. The science journal Nature carried a report of the finding.