426.8 ppm and 49 Million: Two Clocks Running at Once

The World Meteorological Organization reported on 27 October 2026 that the globally averaged surface concentration of carbon dioxide reached 426.8 parts per million in 2025 — 153% of the 1750 pre-industrial baseline. Methane and nitrous oxide also set records, according to the agency's annual Greenhouse Gas Bulletin.

The number is not a surprise. It is a continuation. When the bulletin was first published in 2004, the annual CO2 level was 377.5 ppm. The rise since then has been steady, and WMO Deputy Secretary-General Ko Barrett said growth rates have tripled since the 1960s. The past 11 years are the warmest on record, she said, and the trend is set to continue. Data from individual monitoring stations in WMO's Global Atmosphere Watch show CO2 levels continued to rise in 2026.

What makes the bulletin consequential is not the record itself but the timescale it describes. CO2 persists in the atmosphere for decades to centuries. Every additional part per million traps more heat and intensifies heatwaves, tropical cyclones and rainstorms. The warming already committed cannot be reversed on any human planning horizon. The bulletin was released ahead of COP31, the UN climate summit in Antalya, Turkey, from 9 to 20 November.

A second timeline is moving faster. World Food Programme analysis cited by the World Economic Forum projects that a powerful El Niño could push nearly 49 million more people into acute food insecurity by the end of next year, bringing the total to 274 million across 45 vulnerable countries. Central America and Southern Africa are expected to be among the hardest hit as rainfall and crops are disrupted. The figure is a projection, not a count, and El Niño is not the only driver — fertiliser and seed access problems are already straining food systems.

The mismatch is the story. One number commits the planet to centuries of warming. The other demands a response within months. Both arrive at the same summit, and the policy tools are not interchangeable: mitigation addresses the concentration, adaptation addresses the hunger. COP31 will test whether governments can hold both clocks in view at once.