Yes, the fear is it could become a significant factor over time. Today it is around 1% of the global emissions of methane, but that will increase as global temperatures increase. Eventually we reach a tipping point where the warming feeds back into a viscous cycle where we have more methane produced from bacterial decomposition of the tundra producing more warming.
I have driven the ice road between Inuvik and Tuk and was surprised the many years later at all the problems they had putting in the year round version because of the depths to which the tundra thaws these days.
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