Lenton, T. M. et al. Proc. Natl Acad. Sci. USA 105 , 1786–1793 (2008). Article Google Scholar IPCC. Global Warming of 1.5°C (IPCC, 2018). Google Scholar IPCC. IPCC Special Report on the Ocean and Cryosphere in a Changing Climate (IPCC, 2019). Google Scholar Cai, Y., Lenton, T. M., & Lontzek, T. S. Nature Clim. Change 6 , 520–525 (2016). Article Google Scholar Feldmann, J. & Levermann, A. Proc. Natl Acad. Sci. USA 112 , 14191–14196 (2015). Article Google Scholar Aschwanden, A. et al. Sci. Adv. 5 , eaav9396 (2019). Article Google Scholar Drijfhout, S. et al. Proc. Natl Acad. Sci. USA 112 , E5777–E5786 (2015). Article Google Scholar Lovejoy, T. E. & Nobre, C. Sci. Adv. 4 , eaat2340 (2018). Article Google Scholar Walker, X. J. et al. Nature 572 , 520–523 (2019). Article Google Scholar Rogelj, J., Forster, P. M., Kriegler, E., Smith, C. J. & Séférian, R. Nature 571 , 335–342 (2019). Article Google Scholar Steffen, W. et al. Proc. Natl Acad. Sci. USA 115 , 8252–8259 (2018). Article Google Scholar Schneider, T., Kaul, C. M. & Pressel, K. G. Nature Geosci . 12 , 163–167 (2019). Article Google Scholar Tan, I., Storelvmo, T. & Zelinka, M. D. Science 352 , 224–227 (2016). Article Google Scholar Rocha, J. C., Peterson, G., Bodin, Ö. & Levin, S. Science 362 , 1379–1383 (2018). Article Google Scholar Caesar, L., Rahmstorf, S., Robinson, A., Feulner, G. & Saba, V. Nature 556 , 191–196 (2018). Article Google Scholar Download references