New analysis of Arctic permafrost history reveals that the frozen ground has collapsed three times over the past 27,000 years, each event releasing carbon at levels roughly ten times higher than before the thaw. The findings, published Friday in the journal Science Advances, underscore the potential consequences of unchecked global warming.
Researchers studying ancient climate records found that during these past thawing episodes, the amount of carbon released from permafrost jumped by an entire order of magnitude. That means if current warming trends continue, the Arctic could become a major source of greenhouse gases, potentially overwhelming efforts to reduce emissions elsewhere.
Örjan Gustafsson, a study coauthor and researcher at Stockholm University, told E&E News that any release from thawing permafrost would shrink the remaining carbon budget for human activities before dangerous climate thresholds are crossed. He stressed that the only way to limit permafrost-related emissions is to mitigate climate warming by cutting anthropogenic greenhouse gases.
Why This Matters for Climate Goals
The study's authors point to the 2015 Paris agreement as a key benchmark. If permafrost thaws, the carbon it releases could offset any emissions reductions achieved through policy changes, making it harder to meet the agreement's targets.
The research adds to a growing body of evidence that Arctic permafrost is not a passive storehouse but an active player in the climate system. Past thaw events, while natural, offer a stark warning: the same processes could be triggered by human-induced warming.
While the study does not predict a specific timeline for future thaw, it emphasizes the urgency of reducing emissions now to avoid setting off a self-reinforcing cycle of carbon release and further warming.
New research in Science Advances shows Arctic permafrost thawed three times in 27,000 years, each releasing carbon at ten times pre-thaw levels. Scientists warn that unchecked warming could trigger similar releases, undermining climate goals like the Paris agreement.
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