The Siberian Times brings us this article: 7,000 underground gas bubbles poised to ‘explode’ in Arctic
Their appearance at such high latitudes is most likely linked to thawing permafrost which in is in turn linked to overall rise of temperature on the north of Eurasia during last several decades,’ said a spokesman.
The summer was abnormally hot for the Yamal peninsula, with the air temperature reaching 35C.
This heat impacted on the depth of seasonal thawing which grew both deeper spread wider than in the past, so causing the formation of new lakes and a noticeable change in the regional tundra landscape.
Scientists are simultaneously observing the sudden formation of the large craters, evidently caused by eruptions or explosions of methane gas which has melted below the surface.
This is another situation where warming permafrost is related to the release of the greenhouse gas methane, which then adds to warming. In other words, a positive feedback loop. There are some excellent photos in the article.