China's Revised Carbon Intensity Methodology May Have Erased 700 Million Tonnes of Emissions Growth

China's revised method for calculating carbon intensity may have erased half of the rise in emissions levels over the past five years, according to new research from the Centre for Research on Energy and Clean Air that raises significant concerns about tracking climate progress by the world's largest emitter. Under Beijing's revised calculation, carbon dioxide emissions in China rose 7 percent from 2020 to 2025, compared with a 12.4 percent rise indicated under the previous methodology, a gap amounting to approximately 700 million tonnes of carbon equivalent to the annual emissions of major manufacturing economies such as Germany and South Korea. The revised accounting means that China would appear to be on course to meet its international climate pledge of reducing carbon intensity by 65 percent below 2005 levels by 2030, whereas under the previous methodology that target appeared likely to be missed.

 

The Methodology Change and Its Implications

 

CREA analysts previously reproduced China's carbon intensity data accurately by combining fossil fuel emissions estimates with official GDP growth data, which under this approach showed a 12.4 percent reduction in carbon intensity from 2020 to 2025 against an 18 percent target. The revised data published as part of China's latest five-year plan in March recorded a 17.7 percent reduction, a figure CREA cannot reproduce using the traditional methodology. The think-tank believes Beijing may now be calculating carbon intensity using industrial process emissions and excluding non-energy uses of fossil fuels, though the new definition has not been made public.

CREA noted that while China has never officially defined how it measures carbon intensity, it appears to have made a retrospective change with the effect of making targets easier to meet. The organisation warned that the change in definition weakens China's effective climate targets and introduces more uncertainty into tracking progress against international commitments. The absence of a publicly disclosed methodology makes independent verification of China's climate pledges significantly more difficult, creating a transparency gap at a moment when accurate accounting of the world's largest emitter's progress is particularly consequential for global climate trajectories.

 

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China's Climate Duality and Global Context

 

The findings create a complex picture of China's climate position, which combines world-leading achievements in renewable energy deployment and transport electrification with continued growth in coal use to meet surging energy demand. China's booming renewable energy industry and the electrification of significant portions of its transport system have earned international recognition, with UN climate chief Simon Stiell praising Beijing as a leading light in climate multilateralism and acknowledging China's major role in advancing the global energy transition to a point that is now irreversible. However, the country remains reliant on burning coal to meet its overall energy needs and is not currently on track to meet its goal of carbon neutrality by 2060 under independent assessments.

The contrast between China's renewable energy leadership and its continued fossil fuel dependence reflects the scale of energy demand growth accompanying rapid economic development and electrification. Despite remarkable renewable capacity additions, China's absolute energy consumption has grown faster than clean energy supply, requiring continued coal generation to bridge the gap. The methodological question raised by CREA adds a further layer of complexity to assessing China's actual climate trajectory, as the gap between official data and independently reproduced figures affects not only target compliance assessments but also the calibration of global emissions models used in climate science.

 

Implications for International Climate Accounting

 

The accuracy of China's carbon reporting has significant implications for the global climate architecture, as China's Nationally Determined Contribution targets are central to assessments of whether international commitments are sufficient to limit warming. If the revised methodology materially understates actual emissions growth, it could lead to overestimation of progress toward Paris Agreement goals and affect the design of the New Collective Quantified Goal on climate finance and subsequent policy frameworks. The concerns raised by CREA also highlight the broader challenge of verifying national emissions data in the absence of internationally agreed measurement standards and independent auditing mechanisms.

The timing of the analysis is particularly significant given China's diplomatic positioning as a climate leader, which it has emphasised in contrast to the United States under President Trump, which has reversed multiple Biden-era clean energy policies. Any questioning of the integrity of China's emissions accounting creates geopolitical as well as technical challenges, potentially affecting its credibility in multilateral climate negotiations and its relationships with partners who have aligned their own climate strategies with expectations about China's trajectory. The international community's ability to hold major emitters accountable ultimately depends on the availability of accurate, independently verifiable emissions data.

 

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Outlook for Emissions Data Transparency

 

The CREA analysis reinforces long-standing calls for greater transparency in national greenhouse gas reporting and stronger international standards for emissions measurement and verification. Whether China will clarify its revised carbon intensity methodology and provide sufficient transparency for independent analysts to reproduce its official figures will be an important test of its stated commitment to climate leadership. Greater methodological transparency would strengthen rather than undermine China's climate credentials by enabling international partners to validate its progress against its own commitments.

The broader question of how the international climate community responds to concerns about emissions data integrity from the world's largest emitter will shape the credibility of global climate governance. Multilateral frameworks for emissions verification, including those being developed under Article 6 and the transparency mechanisms of the Paris Agreement, will ultimately determine whether the international community can maintain confidence in the accuracy of national climate progress reporting. Sustained investment in independent data capacity and international verification mechanisms is increasingly essential for the integrity of the global climate architecture.