Policymakers must aim to avoid a 2 °C temperature rise, but plan to adapt to 4 °C.
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Acknowledgements
We thank participants in the September 2009 4 Degrees and Beyond conference (http://www.eci.ox.ac.uk/4degrees), whose contributions stimulated our thinking.
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New, M., Liverman, D. & Anderson, K. Mind the gap. Nature Clim Change 1, 143–144 (2009). https://doi.org/10.1038/climate.2009.126
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DOI: https://doi.org/10.1038/climate.2009.126