Methane release from the not-so-perma-frost is the most dangerous amplifying feedback in the entire carbon cycle (see “NSIDC bombshell: Thawing permafrost feedback will turn Arctic from carbon sink to source in the 2020s, releasing 100 billion tons of carbon by 2100“).
Methane (CH4) deserves attention it is such a highly potent greenhouse gas – 25-33 times more powerful than carbon dioxide (CO2) over a 100-year time-horizon, but as much as 100 time more potent over 20 years, according to the latest research!
Last year I reported on a major study in Science that found the vast East Siberian Arctic Shelf methane stores appeared to be destabilizing and venting. The normally staid National Science Foundation issued a press release warning “Release of even a fraction of the methane stored in the shelf could trigger abrupt climate warming.”
Now there is a new Geophysical Research Letters study on a paleoclimate analog that may be relevant to humanity today, “Methane and environmental change during the Paleocene‐Eocene thermal maximum (PETM): Modeling the PETM onset as a two‐stage event.”