Megaslumps in fluvially incised hummocky moraine, Peel Plateau, northwestern Canada.

In bitter cold regions like northwestern Canada, permafrost has preserved relict ground-ice and vast glacial sedimentary stores in a quasi-stable state. These landscapes therefore retain a high potential for climate-driven transformation. In their open-access GEOLOGY article published online on 7 Feb. 2017, Steven Kokelj of the Northwest Territories Geological Survey and colleagues write that climate-driven renewal of deglaciation and potential postglacial permafrost landscape evolution has major implications for predicting the nature and trajectories of northern landscape change and the cascade of downstream impacts.