A group of researchers made the suggestion in a study released in November based on an analysis of 2,000 years of atmospheric gases trapped in Antarctic ice cores.
Scientists have typically measured today's temperatures against a baseline temperature average for 1850-1900. By that measure, the world is now at nearly 1.3 C (2.4 F) of warming.
But the new data suggests a longer pre-industrial baseline, based on temperature data spanning the year 13 to 1700, which put warming at 1.49 C in 2023, the study published in the journal Nature Geoscience said.
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