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.
Except none of this is actually known. It a hypothesis that has never been demonstrated with repeatable experiments.
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