Carbon emissions from fossil fuels are projected to hit a fresh record high of 37.4bn t in 2024, with "no sign" that these have peaked, a team of scientists said today in the 2024 Global Carbon Budget report.
Total CO2 emissions are projected to reach 41.6bn t in 2024, up from 40.6bn t in 2023, which includes emissions of around 4.2bn t from land-use change, the report found. It also estimates the global carbon budget remaining before the 1.5°C temperature limit set out in the Paris climate agreement is "breached consistently over multiple years".
The remaining carbon budget "has almost run out", the report found. There is a 50pc chance that warming will exceed 1.5°C above pre-industrial levels "consistently in about six years", the report found. There is uncertainty around the estimates, largely owed to the effects of other greenhouse gases (GHGs) such as methane and nitrous oxide, it noted. The Paris accord seeks to limit a rise in global temperature to "well below" 2°C above a pre-industrial average, and preferably to 1.5°C.
This year is on track to be the hottest on record, the World Meteorological Organisation said on 11 November — the opening day of the UN Cop 29 climate summit in Baku, Azerbaijan.
And drought conditions have helped to reverse a recent downward trend in CO2 emissions from land-use change — such as deforestation — in 2024. Those emissions are set to rise in 2024, after falling by 20pc in the past decade, the report found. Permanent CO2 removals from reforestation and planting new trees is "offsetting about half of the permanent deforestation emissions", it added. And the report authors noted that technology-based carbon removals — typically engineered, rather than nature-based — are at current levels only able to account for one-millionth of the CO2 emissions from fossil fuels.
Projections for the highest-emitting countries — China, the US and India — are mixed. China's emissions are projected to increase by 0.2pc in 2024, although the report noted that the range means they could decrease. US emissions are set to drop by 0.6pc, while India's are projected to rise by 4.6pc this year.
The Global Carbon Budget report — which will be peer-reviewed — is produced annually by an international team of more than 120 scientists.
