- As many as 7,000 massive underground methane bubbles, formed by thawing permafrost are set to explode in Siberia. Such explosions, while releasing greenhouse gases, can create massive craters and poses a major safety risk to the local people http://www.digitaljournal.com/news/environment/thousands-of-underground-gas-bubbles-set-to-explode-in-siberia/article/488516#tab=revisions&sc=0 239 comments worldnews
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