Global carbon emissions from fossil fuels have risen again in 2023 -- reaching record levels, according to new research from the Global Carbon Project science team.
The annual Global Carbon Budget projects fossil carbon dioxide (CO2 emissions of 36.8 billion tonnes in 2023, up 1.1% from 2022.
Fossil CO2 emissions are falling in some regions, including Europe and the USA, but rising overall -- and the scientists say global action to cut fossil fuels is not happening fast enough to prevent dangerous climate change.
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 (new forests).
The report projects that total global CO2 emissions (fossil + 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 Center for International Climate Research, Ludwig-Maximilian-University Munich and 90 other institutions around the world.
"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, and leaders meeting at COP28 will have to agree rapid cuts in fossil fuel emissions even to keep the 2°C target alive."
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."
How long until we cross 1.5°C of global warming?
This study also estimates the remaining carbon budget before the 1.5°C target is breached consistently over multiple years, not just for a single year.
At the current emissions level, the Global Carbon Budget team estimates a 50% chance global warming will exceed 1.5°C consistently in about seven years.
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.
Other key findings from the 2023 Global Carbon Budget include:
The Global Carbon Budget report, produced by an international team of more than 120 scientists, provides an annual, peer-reviewed update, building on established methodologies in a fully transparent manner.
The 2023 edition (the 18th annual report) will be published in the journal Earth System Science Data.
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