Iran war has already released a staggering amount of CO2 — and the destruction of schools, homes and buildings is the biggest source
In a new analysis, researchers estimated direct, indirect and future greenhouse gas emissions that were created in the first two weeks of the Iran war, between Feb. 28 and March 14.
The first two weeks of the war between the U.S., Israel and Iran created immense present and future greenhouse gas emissions, draining the global carbon budget faster than 84 countries combined, a new analysis finds.
Between Feb. 28 and March 14, 2026, the warring parties released almost 5.6 million tons (5.1 million metric tons) of carbon dioxide (CO2) and other greenhouse gases by firing carbon-intensive weapons, powering fighter jets and ships, and bombing infrastructure such as oil storage facilities and civilian buildings, researchers found.
"Every missile strike is another downpayment on a hotter, more unstable planet, and none of it makes anyone safer," Patrick Bigger, a co-author of the analysis and a research director at the Climate and Community Institute, a climate and economy think tank, told The Guardian.
The analysis and an accompanying opinion article written by the researchers were published March 21 by the Climate and Community Institute.
The biggest source of CO2 from the conflict in Iran during its first two weeks was the destruction of homes, schools and other buildings, as the rubble will need to be cleared and the infrastructure must be rebuilt after the war ends, according to the analysis. Bigger and his colleagues calculated that these indirect emissions amount to about 2.7 million tons (2.4 million metric tons) of CO2, which is equivalent to the Maldives' yearly emissions. Based on data from Red Crescent Society of Iran, a humanitarian organization, the infrastructure that has been razed includes 16,191 residential buildings, 3,384 commercial units, 77 medical centers and 69 schools, the researchers noted in the study.
The second largest chunk of CO2 emissions from the first 14 days of the war came from the U.S., Israel and Iran's bombarding of oil storage facilities, oil refineries and oil tankers across the Gulf region.
"We expect emissions to increase rapidly as the conflict proceeds, mainly due to the speed [at] which oil facilities are being targeted at an alarming rate," Fred Otu-Larbi, a co-author of the analysis and a researcher at Lancaster University in the U.K. and the University of Energy and Natural Resources in Ghana, told The Guardian. "Just what are the costs, no one really knows, that is why studies like this are so vital."
If more countries join the war, they could significantly boost emissions, the researchers wrote in the analysis. But already, "burning up the annual emissions of Iceland in two weeks is something we really cannot afford," Otu-Larbi said.
The aftershocks of the war are expected to have an even bigger climate impact than the fighting itself, as countries seek to buffer against fuel and fertilizer shocks caused by Iran's blockade of the Strait of Hormuz. Specifically, there could be an increase in drilling for fossil fuels as countries seek to become as energy secure as possible, the researchers said.
Cover photo: The U.S. and Israel struck more than 6,000 targets in Iran in the first two weeks of the war, releasing huge amounts of carbon. This picture was taken March 13 after airstrikes in Tehran. (Image credit: Fatemeh Bahrami/Anadolu via Getty Images)
