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link:https://thinkprogress.org/methane-bubbles-arctic-769bf3f1b099
“…Finally, you may be wondering if the United States has any of these methane land mines, what are called “exploding” or “alternative” pingos. (A regular pingo is “mound of earth-covered ice,” so they don’t generally explode.)
Vladimir E. Romanovsky, a permafrost decay expert at the University of Alaska in Fairbanks, told the Washington Post that the methane-filled alternate pingos are “definitely related to warming,” and could appear in Canada or Alaska.
“It is just a matter of time when some of those craters appear in North America as well,” Romanovsky said. Already, several pingos have emerged “right under the Alaskan pipeline,” the scientist said. If one of those bulges turned out to be an alternative pingo, that’s not good news, either….see link
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