The study indicates that human-driven warming may have reached 1.49 °C above pre-industrial levels in 2023, closer to critical climate thresholds than previously believed.
Andrew Jarvis suggests that existing climate models may underestimate human-driven warming because they use a pre-industrial baseline from 1850 to 1900, which overlooks earlier CO2 increases.
The researchers utilized Antarctic ice-core data from AD 13 to 1700 to establish a more stable pre-industrial baseline, highlighting significant differences in climate estimation.
CO2 levels increased by 142 parts per million above the pre-1700 baseline by 2023, raising alarms about human influence on climate and the urgency to act.
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