Reports of new methane-eruption craters in the Siberian permafrost have piqued the interest of scientists around the higher latitudes who see it as a new sign of a warming climate. The first craters were identified in summer 2014 in the natural gas-rich Yamal Peninsula, which juts into the frigid Kara Sea more than 2,000 miles northeast of Moscow. They're suspected to have been caused by eruptions of methane from beneath the region's permafrost soil, which has been thawing during recent summers.

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