Permafrost carbon Sampling a Yedoma cliff, Sobo Sise island, Lena Delta (Photo: Alfred Wegener Institut) Arctic landscapes, especially those underlain by permafrost, are threatened by climate warming and [...] cycle as greenhouse gases, which accelerate warming and inducing more permafrost thaw and carbon release. This loop is called permafrost–carbon feedback, and as this effect is strengthening itself, it is [...] ked a large amount of carbon. To assess the concern of a permafrost carbon feedback and to develop a better understanding of future permafrost-carbon dynamics, the PETA-CARB project aims at quantifying