Not just permafrost. Due to increased temperatures wetlands are emitting more methane (https://cires.colorado.edu/news/new-analysis-wetlands-other-microbial-sou

Not just permafrost. Due to increased temperatures wetlands are emitting more methane (https://cires.colorado.edu/news/new-analysis-wetlands-other-microbial-sources-fueling-rise-atmospheric-methane https://cires.colorado.edu/news/new-analysis-wetlands-other-...). That is another positive feedback loop, besides the permafrost one, that is increasing the amount of methane in the atmosphere.