ECB Climate Disclosures Show Continued Portfolio Emissions Decline with New Inflation-Adjusted Metrics

The European Central Bank has published its fourth annual set of climate-related financial disclosures, revealing continued declines in absolute carbon emissions across Eurosystem monetary policy portfolios and ECB foreign reserves, driven primarily by the ongoing run-off of these portfolios which declined 13 percent in 2025. The Eurosystem remained on track in 2025 to meet its interim emissions reduction targets set on a relative carbon intensity basis for corporate bonds held for monetary policy purposes, on a pathway consistent with the Paris Agreement and EU climate neutrality objectives. For the first time, the disclosures include inflation-adjusted emissions metrics designed to correct for apparent improvements in carbon intensity driven by rising prices rather than genuine decarbonisation, alongside first-time disclosure of relative metrics for Scope 3 emissions of non-sovereign holdings.

 

New Transparency Measures and Methodological Advances

 

The introduction of inflation-adjusted emissions metrics represents a meaningful methodological advance in the ECB's climate disclosure framework, addressing a known distortion in carbon intensity calculations that use nominal portfolio revenue as the denominator. Higher inflation increases portfolio nominal revenue without reflecting genuine operational improvement, overstating the pace of emissions reduction in intensity metrics and potentially giving a misleading impression of decarbonisation progress that is actually driven by price levels rather than real emissions changes. The inflation-adjusted indicators complement existing metrics and provide additional insight into genuine emissions performance over time, strengthening the analytical credibility of the ECB's climate disclosures for the investors, researchers and policymakers who use them.

The first-time disclosure of relative metrics for Scope 3 emissions of non-sovereign holdings reflects improvements in underlying data quality driven by the expanded coverage of reported financed emissions across the corporate sector, despite remaining data limitations that the ECB acknowledges. Scope 3 emissions represent the bulk of portfolio emissions for non-sovereign holdings, encompassing all indirect emissions in a company's value chain from purchased goods and services through to the use of sold products, making their inclusion essential for a comprehensive assessment of the climate-related risks and impacts embedded in the ECB's investment portfolios. The ECB's willingness to publish these metrics despite acknowledged data limitations reflects a deliberate choice to advance transparency incrementally as data quality improves rather than waiting for perfect information.

 

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Portfolio-Level Climate Performance

 

The Eurosystem's monetary policy portfolios continue their emissions decline primarily through portfolio run-off rather than active reinvestment tilting, as the reduction in overall portfolio size limits the ECB's ability to systematically favour issuers with better climate performance through reinvestment decisions. The ECB acknowledged explicitly that further emissions reductions in these portfolios will depend on issuers themselves taking action to reduce their emissions rather than on portfolio management decisions, reflecting the structural constraint imposed by the run-off trajectory on the climate stewardship tools available to the central bank. This honest accounting of the mechanism through which emissions reductions are being achieved provides useful context for interpreting the positive headline trend.

The ECB's non-monetary policy portfolios show continued independent progress. The staff pension fund's corporate asset carbon footprint declined further in 2025, keeping the portfolio on track toward its medium and long-term climate targets through active investment management rather than passive run-off. The ECB's own funds portfolio increased its green bond share to 33 percent at the end of 2025, channelling €7.6 billion toward the green transition, with a target to increase the green bond share to 35 percent in 2026. This active green bond allocation in the own funds portfolio demonstrates the ECB's capacity to directly support the green transition through investment decisions in the portions of its balance sheet where it retains full discretion over asset selection.

 

Nature-Related Risk Disclosures and Expanding Scope

 

Building on its 2024 disclosures, the ECB has again reported on the exposure of its portfolios to sectors with material dependencies or impacts on nature as identified by the Taskforce on Nature-related Financial Disclosures, recognising the growing importance of nature-related risks and their strong links with climate change. The ECB and Eurosystem continue to monitor improvements in nature-related data quality and the development of associated reporting standards, with an intention to expand nature-related disclosures further as data and methodological standards mature. This commitment to progressive expansion of nature-related reporting reflects the ECB's recognition that biodiversity loss and ecosystem degradation create financial risks that are distinct from but interconnected with climate risks, requiring dedicated analytical frameworks and disclosure mechanisms.

The inclusion of nature-related portfolio exposure alongside climate-related disclosures positions the ECB among the leading central banks in terms of the breadth and sophistication of its sustainability reporting framework. As the TNFD framework gains adoption across the financial sector and nature-related data quality improves through corporate reporting under CSRD and other frameworks, the ECB's disclosed portfolio exposures to nature-dependent and nature-impacting sectors will become increasingly analytically useful for assessing systemic financial risks from biodiversity loss and ecosystem degradation.

 

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Outlook for ECB Climate and Nature Disclosure Development

 

The ECB's fourth annual climate disclosure publication demonstrates a consistent pattern of methodological enhancement and expanding scope that positions the institution as a leader in central bank climate transparency. The addition of inflation-adjusted metrics, first-time Scope 3 relative disclosure and expanded nature-related reporting in a single publication cycle reflects sustained investment in the analytical infrastructure needed to produce genuinely informative climate-related financial disclosures rather than compliance-focused reporting. Whether the ECB can achieve its 35 percent green bond target in the own funds portfolio by end 2026 and continue the Eurosystem's trajectory toward its interim carbon intensity targets will be the practical tests of the commitments outlined in the fourth disclosure.

The broader significance of the ECB's climate disclosure programme extends beyond its own portfolio management to its role in supporting the wider development of climate and nature data quality across European capital markets. By disclosing Scope 3 metrics despite remaining data limitations and by signalling its intention to expand nature-related disclosures as standards improve, the ECB creates demand signals and reporting expectations that influence how corporate issuers, financial institutions and data providers develop their own climate and nature disclosure capabilities. Continued leadership from the ECB and Eurosystem in climate-related financial transparency reinforces the European Union's position as the global standard-setter for sustainable finance disclosure and helps establish the data infrastructure needed for effective climate risk management across the financial system.

 

Source: European Central Bank