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1179. 2024 Saw Fastest-Ever Annual Rise in CO2 Levels

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1179. 2024 Saw Fastest-Ever Annual Rise in CO2 Levels 

 

According to the UK Met Office, the atmospheric CO₂ concentrations at Mauna Loa, Hawaii, showed the fastest annual increase in 2024 since records began in 1958. The measured increase was 3.58 ppm, significantly exceeding the forecast of 2.84 ± 0.54 ppm.

Satellite measurements also showed that the impact of record emissions from burning fossil fuels was amplified by the weakening of natural carbon sinks such as tropical forests and abnormal wildfires, resulting in a very large increase in CO2 around the world. This was due to factors such as the wide range of hot and dry conditions associated with El Niño and climate change.

According to the Intergovernmental Panel on Climate Change (IPCC), atmospheric CO₂ accumulation needs to be slowed down to 1.8 ppm per year in order to limit global warming to 1.5°C as agreed in the Paris Agreement. The rise in CO₂ between 2024 and 2025 is projected to be less extreme than last year, as carbon sinks partially recover as we transition from El Niño to La Niña conditions. However, even a projection of 2.26 ± 0.56 ppm is too high an emission rate to meet the IPCC scenarios of limiting global warming to 1.5°C without overshoot.
 

Contributor: IIYAMA Miyuki, Information Program
 

 

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