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Yedoma – carbon-rich Ice Complex – is Pleistocene-age permafrost (formed during last Ice Age) that contains a significant amount of organic material with ice content of 50– to 90 percent by volume.

Yedoma covers around one million square kilometres along the 7000-km coastline of the East Siberian Arctic Shelf.

Thawing yedoma is a significant source of atmospheric methane.

Image: Yedoma distribution http://apgc.awi.de (Creative Commons Attribution 4.0 License).

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