claim: Benny Peiser conducted a search of peer-reviewed literature on the ISI Web of Science database between 1993 and 2003.
evidence: 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.