Global CO2 from fossil fuels to fall 0.4% in 2026 as renewables and Iran war cut oil use

Fossil emissions expected to dip

The Global Carbon Budget 2026 report, published on Tuesday, 10 November 2026, projects that global CO2 emissions from fossil fuels will fall 0.4% this year, to 38.2 billion tonnes. The study was released as the COP31 climate summit opened in Antalya, Turkey. More than 140 scientists from nearly a hundred institutions took part in the work, according to El Mundo. The researchers attribute the expected fall mainly to a short-term drop in oil use, a response to the energy shock caused by the war in Iran, which began in late February under the Trump administration. The growth of solar and wind power is the second driver, while electric vehicles add a smaller effect.

Oil-1.9%

Gas-0.3%

Coal0.6%

Oil

-1.9 %

Gas

-0.3 %

Coal

0.6 %

Data from the article text

Total emissions still rising

When land-use change such as deforestation is counted, total CO2 is projected to rise 1.2% to 43.3 billion tonnes in 2026, up from 42.8 billion in the previous year. The fossil decline would be the first since the Covid-19 pandemic, when border closures and lockdowns cut emissions in 2020. The authors describe it as probably temporary rather than a sign that emissions have peaked. Global energy demand keeps rising, with data centres and artificial intelligence cited as drivers. Solar, wind and electric vehicles together offset about two-thirds of the emissions tied to that demand growth, the researchers said.

202542.8

2026 (projected)43.3

2025

42.8 billion tonnes

2026 (projected)

43.3 billion tonnes

Data from the article text

Carbon budget almost spent

The remaining carbon budget for keeping warming to 1.5 degrees Celsius above pre-industrial levels is now 150 billion tonnes, which the report says equals less than four years of emissions at the current pace. Pierre Friedlingstein, director of the Global Carbon Budget Office at the University of Exeter, described the budget at the press conference as "essentially exhausted". He noted that the world still emits about 40 billion tonnes of CO2 a year. The report also finds that the land carbon sink has returned to its earlier levels after weakening during the El Niño of 2023-2024. A strong El Niño in 2026 is expected to have a significant impact next year.

Where emissions are falling

Projections cited by El Periódico show fossil emissions in the European Union falling 1.5% a year, China's dropping 0.9% in 2026 and those of the United States falling 1.3%. Japan's emissions have fallen as much as 1% while its economic outlook has improved beyond forecasts. Público reports that between 2016 and 2025, 40 countries, Portugal among them, cut fossil emissions significantly while their economies grew. LaVanguardia notes that China has not increased its CO2 emissions for four years, including 2026, which the study links to a possible structural change. Pep Canadell, director of the Global Carbon Project, spoke at an event organised by the SMC España platform and said:

“If it had not been for the war in Iran, these emissions would most likely have grown a little, or perhaps not grown at all.”

Canadell added that renewables had expanded rapidly in many places and had made the decline larger than the Iran war alone would have caused.

Clean energy and wildfires

Solar and wind power avoided about 4.1 billion tonnes of CO2 in 2025, according to a Nature Climate Change article cited by Público, and that figure could reach 4.6 billion tonnes in 2026. The study authors stress that the 2026 figures are provisional because the final part of the year has yet to be counted. El País reports that El Niño is driving huge wildfires, which add to global warming. Those fires are part of the wider climate picture that the report places alongside the fall in fossil emissions.