1. Stockholm Resilience Centre, Stockholm University, 114 18 Stockholm, Sweden.
2. Future Earth, The Royal Swedish Academy of Sciences, 104 05 Stockholm, Sweden.
3. International Institute for Applied Systems Analysis, 2361 Laxenburg, Austria.
4. ETH Zurich, 8092 Zurich, Switzerland.
5. Potsdam Institute for Climate Impact Research, 14473 Potsdam, Germany.
6. Australian-German Climate and Energy College, School of Earth Sciences, University of Melbourne, Victoria 3010, Australia.