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The reason for this difference is mainly our aerosol emissions
Intergovernmental Panel on Climate Change, Climate Change 2021: Summary for Policymakers. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change, ed. V. Masson-Delmotte et al. (Cambridge: Cambridge University Press, in press), https://www.ipcc.ch/report/ar6/wg1/.