Global greenhouse gas emissions in May 2026 totalled 5.0 billion tonnes CO2 equivalent, a decrease of 0.1% compared to May 2025, according to Climate TRACE’s monthly release published July 30. Year-to-date through May, total global emissions stand at 25.3 billion tonnes CO2e, unchanged from the same period in 2025. Those numbers sit against a backdrop in which global average temperatures have now exceeded 1.5 degrees Celsius above pre-industrial levels for two consecutive years. Flat emissions in absolute terms, at a level still producing year-on-year temperature increases, are not the emissions trajectory consistent with limiting warming. They are the trajectory consistent with continuing it at the current pace.
The flatness at the top line conceals directional divergence across sectors that matters more than the aggregate figure for understanding what is driving the outcome. Manufacturing emissions fell 1.5% year over year, the largest sectoral decline in absolute terms. Transportation fell 0.9%. Fossil fuel operations fell a marginal 0.1%. Against those declines, power sector emissions rose 0.9%, building emissions rose 1.6%, and methane emissions, measured separately, rose 0.1% to 34.2 million tonnes of CH4 in May 2026 alone. The energy transition is producing meaningful reductions in some categories while electricity demand growth is expanding the power sector’s footprint faster than the clean energy build-out can offset it.
The Power Sector’s Expanding Footprint
Power sector emissions of 1,320.8 million tonnes CO2e in May 2026 represent the largest single sectoral total in the Climate TRACE dataset for that month, exceeding manufacturing at 916.0 million tonnes and fossil fuel operations at 779.2 million tonnes. A 0.9% year-on-year increase in the power sector in May, historically a lower-demand month in the northern hemisphere before summer cooling loads peak, signals that electricity demand growth is outpacing clean generation additions in the global average even as individual markets like the United States and China are adding solar and wind capacity at record rates.
The EU bloc provides a specific illustration of the tension. As a combined entity, the EU would rank as the fourth-largest source of emissions globally in May 2026, and its emissions increased by 4.4 million tonnes CO2e compared to May 2025, a 1.5% rise. This sits awkwardly against the narrative of European decarbonisation leadership. The June 2026 heatwave, documented elsewhere as the hottest June on record for Western Europe, drove electricity demand through cooling loads that European buildings were not designed for and that the grid was not prepared to serve with clean power alone. The same climate event that produced record solar output days also produced evening price spikes and power sector emissions above the prior year baseline.
Manufacturing’s Decline and What It Reflects
The 1.5% fall in manufacturing emissions is the most structurally significant positive signal in the May 2026 sectoral data, but it requires contextualisation. Manufacturing emissions are influenced by two distinct forces: changes in industrial output volume, and changes in the energy intensity or fuel mix of that output. A decline driven by lower industrial production, reflecting weaker global goods demand or supply chain adjustment, does not represent a structural decarbonisation of the industrial sector. A decline driven by electrification of process heat, efficiency improvements, or fuel switching toward lower-carbon inputs is structurally different in its implications for the long-term trajectory.
Climate TRACE’s sectoral data does not provide the decomposition between activity and intensity effects that would allow confident attribution. Chinese manufacturing emissions moving in the context of a 0.6% decline in China’s total emissions requires understanding whether that reflects output patterns in energy-intensive industries like steel and cement, which China is managing through overcapacity reduction, or whether it reflects genuine process-level decarbonisation. China’s total emissions of 1.4 billion tonnes CO2e in May 2026, down 8.5 million tonnes year over year, represent the largest absolute national decline among the top five emitters, but against an annual trajectory in which China is simultaneously retiring coal capacity, adding renewable generation, and managing large industrial output volumes, the monthly signal is difficult to interpret without production data.
The Methane Signal
Methane emissions of 34.2 million tonnes CH4 in May 2026, up 0.1% year over year, receive less attention than CO2 in most emissions reporting, but their significance for near-term warming is disproportionate to their volume. Methane’s global warming potential over 20 years is approximately 80 times that of CO2, making even small absolute changes in methane emissions highly consequential for the rate of warming over the next two decades. The 0.1% increase represents approximately 34,000 additional tonnes of CH4 compared to May 2025, equivalent on a 20-year GWP basis to roughly 2.7 million tonnes of CO2e in warming impact over that timeframe.
The sources of methane increase are not broken out in the Climate TRACE monthly release, but the sectoral distribution of global methane emissions is well characterised: fossil fuel operations account for roughly 30% of anthropogenic methane, agriculture and livestock for around 32%, and waste management including landfill for approximately 20%. Fossil fuel operations methane is the most actionable category in the short term because it is technically preventable through leak detection, repair, and flaring elimination with commercially available technology. The Global Methane Pledge, signed by over 150 countries at COP26, committed to a 30% reduction in methane emissions by 2030 from 2020 levels. Monthly data showing a 0.1% year-on-year increase in May 2026 does not indicate progress toward that commitment.
City-Level Patterns and What They Reveal
The urban emissions data provides geographic texture that the national and sectoral aggregates do not. Mannheim and Cologne appearing among the urban areas with the greatest absolute emissions increases in May 2026 reflects the energy system dynamics of a Germany that, despite substantial renewable expansion, still operates gas peakers and remaining coal capacity when wind and solar output is insufficient. Houston’s continued presence in the top five highest-emitting urban areas reflects the concentration of petrochemical and refining infrastructure in the Gulf Coast corridor that has not materially changed in its emissions profile despite national trends.
Dubai and Manama appearing among the cities with the largest absolute emissions declines may partly reflect the demand-reducing effect of industrial output adjustments in Gulf economies managing oil revenue volatility, or energy efficiency investments in the built environment. Seoul’s presence in the same category aligns with South Korea’s aggressive deployment of renewable energy and its nuclear fleet maintenance, which has kept the generation mix relatively stable. Detroit’s decline is consistent with the structural shift in US automotive manufacturing toward electric vehicle platforms, which changes the manufacturing energy mix and associated emissions at the facility level.
The cities with the greatest percentage increases, including smaller industrial centres in China, Brazil, Italy, and Pakistan, indicate that emissions growth at the urban fringe of the global economy, in secondary industrial cities rather than the megacities that dominate absolute rankings, represents an expanding share of the global total that aggregate national targets are poorly positioned to capture. A 30% increase in emissions from Barletta or Uruguaiana may be invisible in national accounting while reflecting genuine local industrial expansion with long-lived infrastructure implications.
