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Methane, the second most common greenhouse gas from human activities after carbon dioxide, is bubbling out from the frozen Arctic much faster than expected and could stoke global warming, scientists have warned.
A study by researchers from the University of Fairbanks in Alaska showed that methane, trapped in the permafrost -- soil at or below the freezing point of water for two or more years -- over time and now 8 million tonnes of it is seeping out every year due to rising temperatures.
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