Global greenhouse gas output ticked up in the first half of 2025, with surging fossil fuel operations and freight demand counteracting reductions in power-sector emissions. Climate TRACE data shows uneven progress, with major economies moving in opposite directions.
Global emissions reached 30.99 billion tons CO₂e from January through June—0.13% higher than the same period last year. Methane rose even faster, climbing 0.49% in June alone. While the increases appear marginal, they underscore the difficulty of sustaining decarbonization momentum at scale.
Fossil Fuels and Freight Tip the Balance
The largest driver of the rise was fossil fuel operations, where emissions grew 1.5% in the first half, equal to an additional 77.65 million tons of CO₂e. More than half of that uptick came from the United States, reflecting expanded oil and gas production. Manufacturing also added pressure, increasing 0.3% globally, led by industrial growth in India, Vietnam, Indonesia, and Brazil.
Transport activity contributed as well, with June emissions up 0.77% year over year. Air and road freight in particular remain sticky sources of growth, according to trade reports, as companies rebalance supply chains around tariffs and shifting trade routes. This mirrors broader trends seen in 2025, where logistics bottlenecks and modal shifts have temporarily outweighed efficiency gains.
Power Sector Cuts Deliver Local Gains
Against this backdrop, power generation offered the biggest relief. Global power sector emissions dropped 0.8% in the first half, or 60.27 million tons of CO₂e, thanks to structural shifts in China and India. Both countries logged measurable declines as renewables continued to expand and coal consumption eased, though the rate of decline remains uneven.
Beyond Asia, localized progress also emerged. China’s overall emissions fell by 0.51%, Mexico’s by 1.71%, and Australia’s by 1.51% in the first half of 2025. By contrast, emissions rose in the U.S., the EU, Brazil, and Indonesia, highlighting the uneven distribution of reductions across global economies. Shanghai, Tokyo, New York, Houston, and Los Angeles remain among the top emitters, while European cities such as Leipzig and Duren recorded some of the steepest year-on-year declines.
The Uncomfortable Math of Incremental Gains
Small efficiency wins are being consistently outpaced by surges in energy and transport demand. For businesses, this signals that climate risk is shifting from being primarily a regulatory compliance issue to an operational one. As the International Energy Agency has noted, fossil fuel demand must fall by more than 25% by 2030 to stay on a 1.5°C pathway, making the current trajectory far off pace. The pressing question is not whether progress is being made, but whether it is fast enough to withstand economic growth and policy shocks in the decade ahead.
