Greenhouse gas concentrations in the world have reached a record level again - WMO
In 2025, the concentration of greenhouse gases in the atmosphere reached the highest level in the history of observations. According to a report by the World Meteorological Organization, the amounts of carbon dioxide (CO₂), methane, and nitrous oxide recorded new records.
Greenhouse gas concentrations in the world have reached a record high again - WMO
According to a new report by the World Meteorological Organization (WMO), the concentrations of carbon dioxide (CO2) and other main greenhouse gases in the atmosphere reached unprecedented high levels in 2025. This has caused planetary temperatures to rise for an even longer duration.
As reported in the WMO Greenhouse Gas Bulletin, the global average surface concentration of CO2 reached 426.8 parts per million (ppm) in 2025, or 153 percent of the pre-industrial baseline level of 1750. Concentrations of methane and nitrous oxide, which rank second and third in importance among long-lived greenhouse gases linked to human activity, also reached new record levels.
“Another year - another new record. Greenhouse gases are trapping heat in the atmosphere at unprecedented levels, driving the intensification of extreme weather events and the associated risks to our economy and society. The last 11 years were the warmest on record, and this trend appears set to continue. CO2 has the property of remaining in the atmosphere for a very long time, which means it will affect the global climate not just for many years, but for decades and even centuries,” said WMO Deputy Secretary-General Ko Barrett.