The World Meteorological Organization announced that 2024 was the warmest year on record, at about 1.55 degrees Celsius above pre‑industrial levels, and the United Nations said governments must deliver new national climate action plans this year to limit long‑term warming to 1.5 degrees Celsius.

The WMO assessment, based on multiple international datasets, also found that the 10 years from 2015 to 2024 were the 10 warmest on record. The Secretary‑General said the assessments "make clear that global heating is a cold hard fact," and urged governments to update climate plans to support vulnerable populations and address worsening climate impacts.

The WMO statement cited six international datasets as the basis for the 2024 assessment. The announcement also reiterated that keeping long‑term global temperatures within 1.5°C will require new or strengthened national climate action plans this year.

The remarks appeared as part of a UN briefing and cited the WMO assessment and a statement by the Secretary‑General. No formal UN action, timelines for submission, or specific country commitments were announced in the briefing. The briefing did not specify what follow‑up, if any, the United Nations secretariat will take to verify the delivery or adequacy of the national climate action plans.