Setting a limit on long-term atmospheric carbon dioxide concentrations merely distracts from the much more immediate challenge of limiting warming to 2 °C.
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Allen, M. Planetary boundaries: Tangible targets are critical. Nature Clim Change 1, 114–115 (2009). https://doi.org/10.1038/climate.2009.95
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DOI: https://doi.org/10.1038/climate.2009.95