A War Cut Emissions. Don't Call That Climate Policy.

Global fossil fuel emissions are projected to fall 0.4 percent in 2026, and the researchers behind the number say a chunk of that drop comes from a US-led war in Iran and the closure of the Strait of Hormuz. Crude prices soared, oil consumption dropped, and the planet got a rounding error of relief. The Global Carbon Budget report, published Tuesday as nations gather at the UN's COP31 climate summit in Antalya, Turkey, describes it as the first annual drop since 2020, when the Covid pandemic paralysed the global economy, trade and transport. That's six years ago, per the report's own timeline.

Read that again. The last time the world's emissions fell, a virus shut down trade. This time, a state-launched war did the work. Neither was a decision anyone made to protect the climate.

The Emissions Bill for a War

The researchers found that the war and the Hormuz closure pushed oil use down "amid soaring crude prices." Oil-related emissions are projected to drop 1.9 percent, but the report calls that "likely a short-term response to the energy shock triggered by the Iran conflict." Gas emissions are set to fall 0.3 percent. Coal use, meanwhile, will rise 0.6 percent. Overall, fossil carbon dioxide emissions are expected to reach 38.2 billion tonnes in 2026.

Pierre Friedlingstein, director of the Global Carbon Budget Office at the University of Exeter, put it plainly: "A decline in fossil CO2 emissions is encouraging, but a reduction driven partly by geopolitical shocks is not a sustainable climate solution." Corinne Le Quere, a climate change science professor at the University of East Anglia, noted that emissions rebounded after earlier shocks, including Covid and the global financial crisis. A rebound is likely "when the oil tensions go away," she said.

So the pattern holds. Economies get hit, people pay more to heat homes and move around, emissions dip, and the moment the powerful settle their quarrel, the curve climbs again. Civilians absorb the price spike. Nobody asked them.

Promises on Paper, Numbers in the Atmosphere

Nations agreed at the 2015 UN climate talks in Paris to keep warming "well below" 2C, while pursuing efforts to limit it to 1.5C. That was 11 years ago. In September, the United Nations declared the long-term 1.5C target would be missed in a matter of years. The remaining carbon budget for staying under 1.5C stands at 150 billion tonnes. At the current rate, the researchers calculated, it's gone in less than four years.

The same state system that signed the pledge is now convening in Antalya to discuss it again. Emissions from the burning of oil, gas and coal rose by 0.9 percent per year on average over the past decade and hit a record high in 2025. That decade includes the Paris era. Total CO2 emissions, counting land-use change such as deforestation, are projected to rise to 43.3 billion tonnes from 42.8 billion tonnes last year. Land-use emissions are climbing partly because of peat fires and forest degradation in southeast Asia, tied to drier conditions linked to this year's exceptionally strong El Nino.

What Actually Moved the Needle

The report does credit something other than bombs and blockades. The deployment of solar panels, wind farms and electric vehicles also contributed to the drop, and two thirds of the increase in global energy demand is being met by solar and wind power and electric vehicles. Friedlingstein's line is that "the long-term answer remains the rapid deployment of clean energy technologies."

The report says nothing about who owns that infrastructure, who profits from it, or whether communities have any say in how it's built. That's a question for the people living next to the panels and the pipelines, not for a summit communique.

Scientists say it's crucial to cut fossil fuel emissions to limit the period of "overshoot" above 1.5C and bring temperatures back down as quickly as possible. Meanwhile the most effective emissions cut of 2026 came packaged with a war, and the researchers themselves are warning it won't last.