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Brian Vasel/NOAA, public domain Carbon dioxide averaged 426.8 parts per million at the Earth's surface last year, the World Meteorological Organization said on 27 October, with methane and nitrous oxide also at record highs.
Carbon dioxide averaged 426.8 parts per million at the Earth's surface last year, the World Meteorological Organization said on 27 October, with methane and nitrous oxide also at record highs.
The 2026 Lancet Countdown report estimates that heat was linked to about 710,000 deaths in 2023 and, for the first time, attributes more than 70% of that toll to human-caused warming.