http://www.nature.com/news/mysterious-siberian-crater-attributed-to-methane-1.15649
Several huge sinkholes have been appearing lately. Warming permafrost and released methane is now considered the likely cause. Not good.
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http://www.nature.com/news/mysterious-siberian-crater-attributed-to-methane-1.15649
Several huge sinkholes have been appearing lately. Warming permafrost and released methane is now considered the likely cause. Not good.