1. Institute of Geophysics, Swiss Federal Institute of Technology in Zurich (ETHZ) NO H66, Sonneggstrasse 5, CH-8092 Zurich, Switzerland
2. International Institute for Applied Systems Analysis (IIASA), Laxenburg, Austria
3. Human-Environment Systems, Department of Environmental Systems Science, Swiss Federal Institute of Technology in Zurich (ETHZ), Switzerland
4. Centre for Early Warning Systems, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany