The World Meteorological Organization (WMO) warned that greenhouse gas levels reached a new record last year, implying a hotter future for the planet. This scenario is reinforced by a new report released by the organization.
According to the report, concentrations of carbon dioxide (CO2) and other crucial gases reached unprecedented levels in 2025, consolidating a more significant long-term increase in global temperature.
Last year, the global average surface CO2 concentration was 426.8 parts per million, representing 153% of the reference level established before the industrial era in 1750. Furthermore, concentrations of methane and nitrous oxide, considered the second and third most relevant long-lived greenhouse gases linked to human activities, also registered new highs.
The world's average methane concentration stood at 1,948 parts per million (which corresponds to 267% of the 1750 level), while nitrous oxide exceeded the level recorded at that time by 126%.
Methane contributes approximately 16% of the climate warming caused by long-lived greenhouse gases, although it has a considerably shorter lifespan than CO2. The organization detailed that about 35% of methane is released from natural sources, such as wetlands, which are vulnerable to climate change, and almost 65% comes from anthropogenic sources, including livestock, rice cultivation, fossil fuel extraction, landfills, and biomass burning.
Nitrous oxide, being the third most important long-lived greenhouse gas, originates from both natural sources and human activities, such as fertilizer use, industrial processes, and biomass burning.
Ko Barrettt, Deputy Secretary-General of the WMO, warned in a statement that 'another year, another new record. Greenhouse gases are trapping an unprecedented amount of heat in the atmosphere, providing energy for more extreme weather phenomena and associated risks to our economies and societies.'
The same source indicated that the last eleven years have been the hottest ever documented and that this trend is expected to persist. The WMO official emphasized that, given the long residence time of CO2, it will continue to influence the global climate not only for years, but for decades and even centuries.



