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Permafrost soils store large quantities of organic carbon and are often portrayed as a critical tipping element in the Earth system, which, once global warming has reached a certain level, suddenly and globally collapses. Yet this image of a ticking timebomb, one that remains relatively quiet until, at a certain level of warming, it goes off, is a controversial one among the research community. Based on the scientific data currently available, the image is deceptive, as an international team has shown in a recently released study. According to their findings, there is no single global tipping point; rather, there are numerous local and regional ones, which tip at different times, producing cumulative effects and causing the permafrost to thaw in step with climate change.

Jan nitzbonAlfred wegener instituteHelmholtz centre for polarMarine researchNorthern hemisphereGreenland ice sheetHelmholtz centreAssessment report