three languages (Photo: Alfred-Wegener-Institut) Siberian permafrost ecosystems in transition - over 25 years of joint research Siberian permafrost and the ecosystems there are of global importance due to [...] Institute Helmholtz Centre for Polar and Marine Research (AWI), Bremerhaven and Potsdam Melnikov Permafrost Institute, Siberian Branch, Russian Academy of Science (MPI SB RAS), Yakutsk German Centre for [...] with the climate. For more than 25 years we have been researching the interrelationships between permafrost, biodiversity and climate in close and friendly cooperation. With joint Arctic expeditions, jointly