There is a ton of misinformation in my replies so here is a primer on permafrost carbon. Permafrost stores a HUGE amount of carbon because ancient life took up CO2, built biomass, then died. That organic matter (~50% C) slowly accrued in Earth's best freezer for 1000s of yrs. 1/
ALT Photograph of a man wearing a baseball hat and a blue t shirt with overalls holding up a permafrost core while kneeling on the ground in a forest.