World Meteorological Organization

New Capabilities

Publisher of the annual Greenhouse Gas Bulletin

The World Meteorological Organization's annual greenhouse gas bulletin confirms that carbon dioxide, methane, and nitrous oxide all reached record global concentrations in 2025. CO2 averaged 426.8 parts per million, 153% of the pre-industrial baseline and up from 377.5 ppm when the bulletin began in 2004.

Updated 2 hours ago

Built World

Issued 'Prepare for El Niño' bulletin in June 2026, calling for global early warning action

NOAA declared El Niño on June 11, and the event has since blown past forecasters' early estimates. By October, Pacific sea-surface temperatures exceeded 4.0°C above average in parts of the eastern equatorial Pacific, and NOAA put a strong-to-very strong El Niño through January-March 2027 at greater than 83 percent. The chance the event tops the strongest on record since 1950 reached 83 percent for October-December.

Updated Oct 16