Revised 30 August 2021



Lenton, T.M. et. al. 'Tipping elements in the Earth’s climate system', Proceedings of the National Academy of Sciences, v.105, 2008, pp. 1786–93. https://doi.org/10.1073/pnas.0705414105


Steffen, W. et. al. 'Trajectories of the Earth System in the Anthropocene', Proceedings of the National Academy of Sciences v. 115, 2018, pp. 8252–59. https://doi.org/10.1073/pnas.1810141115



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