Estimated human-induced warming from a linear temperature and atmospheric CO2 relationship

Jarvis, Andrew and Forster, Piers M. (2024) Estimated human-induced warming from a linear temperature and atmospheric CO2 relationship. Nature Geoscience, 17 (12). pp. 1222-1224. ISSN 1752-0894

Abstract

Assessing compliance with the human-induced warming goal in the Paris Agreement requires transparent, robust and timely metrics. Linearity between increases in atmospheric CO2 and temperature offers a framework that appears to satisfy these criteria, producing human-induced warming estimates that are at least 30% more certain than alternative methods. Here, for 2023, we estimate humans have caused a global increase of 1.49 ± 0.11 °C relative to a pre-1700 baseline.