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 capped the Extraordinary World Meteorological Congress held in Geneva from 20 to 24 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.
