China's Q2 2026 CO2 Emissions Fall 1% as Oil Use Plunges 9%

For the climate and energy community, the world's largest emitter just delivered a first-of-its-kind data point: a quarterly emissions decline driven by oil, not coal. The Q2 2026 fall of 1% — with transport oil use down 16% amid the Strait of Hormuz crisis — tests whether China's two-year emissions plateau can survive geopolitical shocks and hints at how durable its decarbonization levers really are.

China's carbon dioxide (CO2) emissions fell by 1% in the second quarter of 2026, according to analysis published by Carbon Brief on 2 September 2026, as the Strait of Hormuz crisis sent the country's oil consumption plunging by 9% overall and 16% for transport. The headline number is modest, but the mechanism behind it is a genuine milestone: this is the first time on record that reduced oil consumption — rather than coal — has been responsible for an overall fall in China's emissions. In every previous decline, the coal-fired power sector was the decisive lever, which makes this shift in the structure of China's emissions profile worth close attention.

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The Q2 2026 fall of 1% — with transport oil use down 16% amid the Strait of Hormuz crisis — tests whether China's two-year emissions plateau can survive geopolitical shocks and hints at how durable its decarbonization levers really are.

The decline came despite a continued rebound in coal-fired power generation, underscoring how unusual the quarter was. China's emissions peaked in March 2024 and have since held to what Carbon Brief has described as a 'flat or falling' plateau for more than two years. That plateau was interrupted by a 2% year-on-year increase in the first quarter of 2026, driven not by rising demand but by an increase in 'wasted' wind and solar power — curtailment that pushed fossil generation higher. The second-quarter fall of 1% therefore brings the first half of 2026 to only a marginal increase, keeping emissions below their 2023-24 peak.

The oil story is the crux. The Strait of Hormuz crisis disrupted Gulf supply routes, and China's transport sector absorbed the shock with a 16% cut in oil use. That is a sharp, crisis-driven contraction, and it raises an important analytical caveat: the decline is not necessarily durable. If the strait reopens and prices normalize, some of that oil demand could return. Yet the episode also exposes how concentrated China's oil import route is, and it compounds structural pressures already bearing down on oil demand — electrification of transport, continued declines in real-estate construction, and slower growth in coal-based chemicals. For climate observers, the key question is how much of this oil reduction survives the crisis and how much proves to be temporary rationing.

Government policy was unusually active during the quarter. Multiple energy-related five-year plan documents were released, including measures to address solar and wind curtailment — the very problem that inflated emissions in Q1 — and a signal of a higher bar for new coal-power plant approvals. Tellingly, the plans added few new quantitative targets. This suggests a shift from headline capacity goals toward operational quality: making the clean power that already exists actually reach the grid and displace fossil generation, rather than simply adding more nameplate capacity. If curtailment measures work, they would directly attack the 'wasted' wind and solar that drove the Q1 emissions uptick.