The rapid transformation of glacial into periglacial mountain landscapes under conditions of continued global warming can cause new and locally severe changes in hazard and risk conditions. A special focus must be on systematically increasing risks due to far-reaching flood waves or debris flows caused by rock/ice avalanches into new lakes at the foot of steep slopes with decreasing stability due to permafrost degradation and/or glacial de-buttressing. Modeling permafrost occurrence and glacier-bed topography provides important information for anticipating critical future situations.