Greenhouse gas levels hit record highs, climate impact to last centuries: UN

Greenhouse gas concentrations in the atmosphere rose to record highs in 2025, locking in climate impact that will persist for centuries to come, the United Nations said on Tuesday. Levels of the three main greenhouse gases – the climate-warming carbon dioxide, methane and nitrous oxide – all rose to unprecedented figures in 2025, the UN’s weather and climate agency said. The World Meteorological Organization (WMO) said the rise would lead to more long-term temperature increases for the...