Atmospheric CO2 Soared in 2024

April 2025

"Scientists are worried because they can’t fully explain the big jump, but they think it might mean that carbon absorption by forests, fields and wetlands is slowing down — a major problem for the world."

"The latest anomaly in the climate system that can’t be fully explained by researchers is a record annual jump in the global mean concentration of carbon dioxide in the atmosphere measured in 2024.

The concentration, measured in parts per million, has been increasing rapidly since human civilizations started burning coal and oil in the mid-1800s from the pre-industrial level of 280 ppm.

In recent decades, the increase has often been in annual increments of 1 to 2 ppm. But last year, the increase measured by the National Oceanic and Atmospheric Administration’s Global Monitoring Laboratory was 3.75 ppm, according to the lab’s early April update of atmospheric greenhouse gas concentrations.

That brings the annual mean global concentration close to 430 ppm, about 40 percent more than the pre-industrial level, and enough to heat the planet by about 2.7 degrees Fahrenheit (1.5 degrees Celsius). Climate researchers have noted that the continuing increase of global CO2 emissions means the world will probably not be able to reach the Paris Agreement target of limiting warming to 2.7 degrees Fahrenheit above the pre-industrial level."