I’ve seen some worrying about whether melting permafrost would jack up temperatures far more due to methane. I am skeptical about that, as methane is also yummies for certain soil bacteria. The methane that gets left in the atmosphere may be much less than what gets liberated by melting permafrost.
The permafrost will stop melting as Alaska continues to cool (over a decade) and Siberia levels off. It’s really only melting on momentum at the moment. Much of the methane is not in land-based permafrost but under the Arctic ocean and is protected by pressure and permanent cold just as it is in the Gulf of Mexico.