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Summary

WMO reports 2024 as the warmest year on record at +1.55 °C above the 1850–1900 baseline, with record-high CO₂, CH₄ and N₂O in 2023 and continued increases in 2024; ocean heat content and mean sea level rose further, ocean acidification intensified, glaciers continued to lose mass, and Antarctic sea ice hit the second-lowest extent on record. The report underscores escalating high-impact events and urges accelerated investment in multi-hazard early warning systems and climate services.