 According to a CAGE researcher, Aleksei Portnov,

In April 2019, Turetsky et al.reported permafrost was thawing quicker than predicted, and was happening even to thousands years old soil; They estimated that abrupt permafrost thawing could release between 60 and 100 gigatonnes of carbon by 2300, they mentioned gaps in the research and that abrupt permafrost thawing should have priority research and urgency.Climate models considering only gradual permafrost thaw are substantially underestimating carbon emissions from thawing permafrost.