CO2 Levels Hit Highest Ever Recorded, Warning of More Extreme Weather

From 2023 to 2024, the global average concentration of CO2 rose by 3.5 parts per million – the largest increase since modern measurements started in 1957, according to the report, published ahead of next month’s United Nations Climate Change Conference in Brazil.

The burning of fossil fuels and an increase in wildfires, particularly in South America, drove the rise in CO2 levels over the last year, it said, stressing more needs to be done to reduce emissions. 

“The heat trapped by CO2 and other greenhouse gases is turbo-charging our climate and leading to more extreme weather,” WMO Deputy Secretary-General Ko Barrett said.

Concentrations of other important greenhouse gases, methane and nitrous oxide, also rose to record levels, increasing by 16% and 25% respectively against pre-industrial levels, while CO2 rose by 52%.

“This gas (CO2) accumulates in the atmosphere. It has a very long lifetime … every single molecule which is emitted in the atmosphere will have a global impact,” Oksana Tarasova, WMO senior scientific officer, told a briefing in Geneva. 

“The heat trapped by CO2 and other greenhouse gases is turbo-charging our climate and leading to more extreme weather,” WMO Deputy Secretary-General Ko Barrett said.

Concentrations of other important greenhouse gases, methane and nitrous oxide, also rose to record levels, increasing by 16% and 25% respectively against pre-industrial levels, while CO2 rose by 52%.

“This gas (CO2) accumulates in the atmosphere. It has a very long lifetime … every single molecule which is emitted in the atmosphere will have a global impact,” Oksana Tarasova, WMO senior scientific officer, told a briefing in Geneva.