Planet-Warming Greenhouse Gas Concentrations Surged to Historic Levels in 2025, WMO Says

Atmospheric concentrations of all three major planet-warming greenhouse gases reached new highs in 2025, committing the planet to rising temperatures for many years to come, the World Meteorological Organization (WMO) has said. When the UN agency released its first assessment 22 years ago, carbon dioxide (CO2) concentrations stood at 377.1 parts per million (ppm). Last ...