Greenhouse gases reach record concentrations in 2025, reports UN

Concentrations of greenhouse gases, the main driver of climate change, have reached a record level in 2025, dooming the planet to "a warmer future", warned the UN on Tuesday October 27. According to the World Meteorological Organization's (WMO) annual greenhouse gas bulletin, atmospheric concentrations of carbon dioxide (CO2), methane (CH4) and nitrous oxide – the three most important persistent greenhouse gases linked to human activities – broke records last year.

"A new year, a new record. Greenhouse gases are trapping unprecedented amounts of heat in the atmosphere, fueling the intensification of extreme weather events and the associated risks to our economies and societies," observed WMO Deputy Secretary-General Ko Barrett. “The last eleven years have been the hottest on record, and this trend is expected to continue. CO2 is very long-lived and will therefore impact the global climate not only for years, but for decades and even centuries,” she added.