Geneva:Greenhouse gas concentrations reached new record highs in 2025, According to United Nations, resulting in climate impacts that are expected to persist for centuries. The levels of carbon dioxide, methane, and nitrous oxide all rose to unprecedented figures, as reported by the UN's weather and climate agency.
According to Bangladesh Sangbad Sangstha, the World Meteorological Organization (WMO) indicated that this rise in greenhouse gas concentrations is anticipated to lead to further long-term temperature increases globally. The findings were published in the WMO's 22nd annual Greenhouse Gas Bulletin, which precedes the COP31 UN climate summit set to take place in Antalya, Turkey, from November 9 to 20.
Ko Barrett, WMO deputy secretary-general, emphasized the increasing heat trapped in the atmosphere by these gases, which fuels extreme weather events and poses risks to economies and societies. Barrett noted, "The past 11 years have been the warmest on record and this trend is set to continue." The bulletin highlights that carbon dioxide concentrations were at 426.8 parts per million (ppm) in 2025, with methane and nitrous oxide also at significantly elevated levels compared to pre-industrial times.
A notable observation from the report is the smaller increase in CO2 concentration from 2024 to 2025, attributed to the recovery of land carbon sinks and reduced fire emissions following the 2023/2024 El Nino event. Despite this, the increase still surpasses the average growth rate of previous decades.
Concerns were also raised regarding the rising levels of molecular hydrogen (H2) and sulfur hexafluoride (SF6), which are linked to electricity production and distribution. SF6, in particular, is highlighted for its extensive atmospheric lifetime and high global warming potential, necessitating further attention as energy systems shift towards decarbonization.