CO₂ concentrations in the atmosphere at their highest level since records began
This is the biggest annual increase since modern measurements started in 1957.
The planet is now seeing the fastest rise in CO₂ since records began. This is according to the World Meteorological Organization (WMO): CO₂ levels jumped by 3.5 parts per million in 2024 the biggest annual increase since modern measurements started in 1957.
Concentrations reached 423.9 ppm last year, 52% higher than before the Industrial Revolution. The WMO points to record fossil fuel use, widespread wildfires, and the weakening ability of forests and oceans to absorb carbon as key reasons behind the surge.
"The heat trapped by CO2 and other greenhouse gases is turbo-charging our climate and leading to more extreme weather. Reducing emissions is therefore essential not just for our climate but also for our economic security and community well-being," says WMO.
Methane and nitrous oxide, the other main greenhouse gases, also hit record levels in 2024. Scientists warn that natural "sinks" like forests and oceans are losing their ability to capture CO₂, turning what used to be a buffer into part of a dangerous feedback loop.
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