Antalya:Levels of carbon dioxide (CO2) and other major greenhouse gases in the atmosphere reached unprecedented highs in 2025, contributing to long-term temperature increases on Earth, according to a new report from the World Meteorological Organization (WMO).

According to Azerbaijan State News Agency, the WMO Greenhouse Gas Bulletin reported that the globally averaged surface concentration of CO2 in 2025 was 426.8 parts per million, which is 153% of the 1750 pre-industrial baseline. Additionally, concentrations of methane and nitrous oxide, the second and third most important long-lived greenhouse gases related to human activities, also rose to new records.

WMO Deputy Secretary-General Ko Barrett stated, "Another year, another new record. Greenhouse gases are trapping an unprecedented amount of heat in the atmosphere, providing energy for more extreme weather and associated risks to our economies and societies." Barrett emphasized that the past 11 years have been the warmest on record, and this trend is expected to continue. He noted that CO2 has a very long lifetime, impacting the global climate for decades and even centuries.

The WMO releases the Bulletin, one of its flagship annual publications, to provide authoritative scientific information for negotiators at the UN Climate conference. The COP 31 meeting in Antalya, Türkiye, from 9-20 November 2026, aims to transform climate commitments into concrete actions.