1. Raftery, A. E., Zimmer, A., Frierson, D. M. W., Startz, R. & Liu, P. Less than 2 ∘C warming by 2100 unlikely. Nat. Clim. Chang. 7, 637 (2017).
2. United Nations. World Population Prospects: The 2015 Revision (United Nations, New York, New York, USA, 2015).
3. Intergovernmental Panel on Climate Change. Climate Change 2013: The Physical Science Basis. Working Group I Contribution to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (WMO/UNEP, 2014).
4. UNFCCC. Adoption of the Paris Agreement. http://unfccc.int/resource/docs/2015/cop21/eng/l09r01.pdf (2015).
5. United Nations Climate Change. National Determined Contributions. https://www4.unfccc.int/sites/NDCStaging/Pages/Home.aspx (2018).