Iran War-Driven Price Hikes Trigger Global Carbon Emissions Drop

Global carbon dioxide emissions are expected to fall by about 150 million tonnes (Mt) in 2026, marking the first annual decline since the pandemic in 2020. This drop is largely attributed to the price increases resulting from President Trump's military action against Iran in February. The equivalent carbon prices for oil and gas price increases were estimated to be $298 per tonne of carbon on oil and $848 on European gas.

According to calculations, consumers collectively paid about $869 billion in extra payments, which translates to an $87 per tonne carbon tax across all fossil fuel emissions. This results in a cost-per-tonne of abatement of more than $21,000 per tonne of carbon.

The experiment shows that substantially increasing the costs of energy is off the table as a policy option for achieving deep decarbonization, according to Roger Pielke Jr.'s iron law of climate policy. The natural experiment launched by the Trump administration's war with Iran provides a clean test of this theory.