WMO Extraordinary Congress adopts resolution for the Global Greenhouse Gas Watch

Update

28 October 2025

On 23 October 2025, the Extraordinary World Meteorological Congress (Ext-Cg 2025) adopted a resolution to advance the Global Greenhouse Gas Watch (G3W), a WMO initiative to deliver objective, science-based analysis of greenhouse gas concentrations and their sources and sinks.

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Three officials sit at a conference table with microphones and nameplates; a projected image of the panel is shown above them.

Prof. Celeste Saulo, WMO Secretary-General; António Guterres, Secretary-General of the United Nations; Dr Abdulla Al Mandous, WMO President.

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The decision sets the direction for the next phase of G3W. The system will integrate data from surface-based measurements (in situ and remote sensing), balloon and aircraft observations, and Earth-observation satellites. These observations will feed advanced modelling systems that simulate greenhouse gas dynamics and provide an accurate, transparent picture of Earth’s atmosphere.

WMO Infrastructure Director, Nir Stav, said WMO will continue to serve decision-makers with authoritative, science-based information as a “barometer of truth” to guide effective climate action.

The endorsement happened on the last day of the Extraordinary World Meteorological Congress held in Geneva from 20 to 23 October 2025, marking 75 years of international cooperation on weather, climate and water.

On this occasion, António Guterres, Secretary-General of the United Nations, visited WMO. His speech underlined the value of an objective, scientific organization that provides credible information on the state of the planet.

For more information on G3W activities, please consult:

Resolution Cg-Ext (2025)-D02-2: Implementation of the Global Greenhouse Gas Watch
Global Greenhouse Gas Watch (G3W) website
World Meteorological Congress Extraordinary Session (2025) – Session information

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