Climate emissions increasing

Carbon dioxide (CO₂) emissions of 36.8 billion tonnes are expected in 2023, up from 2022, according to the annual Global Carbon Budget.

Fossil emissions are falling in some regions, including Europe and the USA, but rising overall. Scientists say global action to cut fossil fuels is not happening fast enough to prevent dangerous climate change.

“The impacts of climate change are evident all around us, but action to reduce carbon emissions from fossil fuels remains painfully slow,” said Professor Pierre Friedlingstein, of Exeter’s Global Systems Institute, who led the study. “It now looks inevitable we will overshoot the 1.5°C target of the Paris Agreement.” 

Warming

Emissions from land-use change such as deforestation are projected to decrease slightly but are still too high to be offset by current levels of reforestation and afforestation. 

The report projects that total global CO₂ emissions from fossil and land-use change will be 40.9 billion tonnes in 2023. This is about the same as 2022 levels, and part of a 10-year “plateau” – far from the steep reduction in emissions that is urgently needed to meet global climate targets. 

The research team included the University of Exeter, the University of East Anglia (UEA), CICERO Centre for International Climate Research, Ludwig-Maximilian-University Munich and 90 other institutions around the world.

At the current emissions level, the Global Carbon Budget team estimates a 50 per cent chance global warming will exceed 1.5°C consistently in about seven years. 

Decarbonise

This estimate is subject to large uncertainties, primarily due to the uncertainty on the additional warming coming from non-CO₂ agents, especially for the 1.5°C targets which is getting close to the current warming level.

However, it’s clear that the remaining carbon budget – and therefore the time left to meet the 1.5°C target and avoid the worse impacts of climate change – is running out fast.

Professor Corinne Le Quéré, Royal Society Research Professor at UEA’s School of Environmental Sciences, said: “The latest CO₂ data shows that current efforts are not profound or widespread enough to put global emissions on a downward trajectory towards Net Zero, but some trends in emissions are beginning to budge, showing climate policies can be effective.

“Global emissions at today’s level are rapidly increasing the CO₂ concentration in our atmosphere, causing additional climate change and increasingly serious and growing impacts. 

"All countries need to decarbonise their economies faster than they are at present to avoid the worse impacts of climate change."

Findings

1. Regional trends vary dramatically. Emissions in 2023 are projected to increase in India (8.2%) and China (4.0%), and decline in the EU (-7.4%), the USA (-3.0%) and the rest of the world (-0.4%).
2. Global emissions from coal (1.1%), oil (1.5%) and gas (0.5%) are all projected to increase.
3. Atmospheric CO₂ levels are projected to average 419.3 parts per million in 2023, 51% above pre-industrial levels.
4. About half of all CO₂ emitted continues to be absorbed by land and ocean “sinks”, with the rest remaining in the atmosphere where it causes climate change.
5. Global CO₂ emissions from fires in 2023 have been larger than the average (based on satellite records since 2003) due to an extreme wildfire season in Canada, where emissions were six to eight times higher than average.
6. Current levels of technology-based Carbon Dioxide Removal (ie excluding nature-based means such as reforestation) amount to about 0.01 million tonnes CO₂, more than a million times smaller than current fossil CO₂ emissions.

This Author

Ruby Harbour is a freelance journalist. This article is based on The Global Carbon Budget report, which is produced by an international team of more than 120 scientists and provides an annual, peer-reviewed update, building on established methodologies in a fully transparent manner. The 2023 edition (the 18th annual report) is published in the journal Earth System Science Data.