1. Centre for the Study of Existential Risk, University of Cambridge, Cambridge CB2 1SB, UK
2. Darwin College, University of Cambridge, Cambridge CB3 9EU, UK
3. School of Life Sciences, Nanjing University, Nanjing 210023, China
4. Cambridge Centre for Environment, Energy and Natural Resource Governance, University of Cambridge, Cambridge CB2 3QZ, UK
5. Center for Health and the Global Environment, University of Washington, Hans Rosling Center for Population Health, Seattle, WA 98195
6. Future of Humanity Institute, University of Oxford, Oxford OX2 0DJ, UK
7. Department of Anthropology, Washington State University, Pullman, WA 99164-4910
8. Santa Fe Institute, Santa Fe, NM 87501
9. Cluster of Excellence ROOTS, Christian-Albrechts-Universität, Kiel 24118, Germany
10. Potsdam Institute for Climate Impact Research, Telegraphenberg, Potsdam 14473, Germany
11. Department of Environmental Sciences, University of Wageningen 6708PB, the Netherlands
12. Earth System Science Department, Tsinghua University, Beijing, China
13. Fenner School of Environment and Society, The Australian National University 2601, Australia
14. Global Systems Institute, University of Exeter, Exeter EX4 4QE, UK