European banks have spent much of the past decade building systems to measure climate risk. Regulators are now broadening their focus to the financial consequences of biodiversity loss, water stress, pollution and ecosystem degradation.
In prudential terms, these environmental pressures can feed into credit, market, operational, concentration and business-model risks.
CRR3 defines environmental risk broadly, covering physical and transition risks and linking them to the six environmental objectives of the EU Taxonomy. These include water and marine resources, pollution, circularity, biodiversity and ecosystems.
For banks, the relevant question is how these pressures affect financial risk. Water shortages can disrupt a manufacturer’s output. Deteriorating soil quality can weaken an agricultural borrower. Tighter environmental regulation can alter the economics of a business model.
The ECB set out its expectations in 2020 in its guide on climate-related and environmental risks. Significant institutions were expected to incorporate those risks into strategy, governance, risk appetite, credit risk, stress testing and ICAAP.
Those expectations have since become more embedded in supervision. The ECB has imposed bank-specific remediation requirements, incorporated findings into supervisory reviews and, where shortcomings persisted, used binding measures.
The EBA has added a harmonised EU-wide framework. Its Guidelines on the management of ESG risks have applied to most institutions since January 2026, with small and non-complex institutions given until January 2027.
The Guidelines require banks to identify, measure, manage and monitor ESG risks across short, medium and long time horizons. Material environmental risks are expected to sit within the bank’s existing risk-management processes.
This broadens the scope of work already under way on climate risk. Banks also need to consider other environmental risks where they are financially material.
Banks first need to establish where environmental risks could have a material financial effect.
Sector analysis can identify areas of potential exposure. More detailed assessment may then be needed at counterparty and asset level, particularly as access to water, land or other ecosystem services often depends on location.
This creates a need for more granular information. Banks may require data on operating locations, production activities, supply chains and environmental conditions alongside conventional financial and sector data.
The analysis should establish how a particular dependency or exposure could affect revenues, costs, asset values, insurance or debt-servicing capacity.
A materiality assessment has practical consequences for risk management.
A bank that identifies exposure to water stress or biodiversity loss will need to determine how that finding affects its treatment of the borrower or portfolio. It may prompt additional due diligence, closer client engagement, changes to loan terms, different collateral assumptions or tighter portfolio monitoring.
The ECB and EBA frameworks increasingly point towards this kind of integration.
Material nature-related risks may need to be reflected in underwriting, risk appetite, concentration management, ICAAP, stress testing and client engagement. They may also influence strategic decisions where a bank has significant exposure to vulnerable sectors or regions.
Supervisors will therefore be interested in the connection between the assessment and the resulting risk-management decisions.
From January 2027, the EBA’s environmental scenario-analysis Guidelines will apply.
They cover shorter-term stress testing of potential effects on capital and liquidity, as well as longer-term analysis of the resilience of a bank’s strategy and business model.
Methods for nature-related risks are still developing, and the EBA recognises limitations in the available data and modelling approaches.
Banks will need to identify which environmental risks are material enough to include in scenario analysis and trace their potential financial effects. This could include assessing the consequences of water constraints for borrowers in exposed sectors or environmental policy changes for particular portfolios.
The Guidelines bring these risks more explicitly into banks’ existing scenario-analysis frameworks.
For most institutions, the practical route is to extend existing prudential systems to cover material environmental risks.
Banks can begin with portfolio screening and move to more detailed assessment where exposures appear significant. This involves identifying the relevant environmental drivers, obtaining sufficient information on counterparties and locations, and understanding the implications for financial performance.
The results then need to feed into existing risk processes, including credit, portfolio management, risk appetite and ICAAP.
Banks will also need clear documentation of methodologies, assumptions, proxies and data gaps. Nature-risk methodologies are still developing, so consistency and transparency will matter alongside analytical sophistication.
The EU has yet to prescribe a standalone capital charge or single prudential metric for nature. Its expectations for risk management are, however, becoming clearer.
Where environmental degradation creates material financial risk, banks are expected to identify, assess and manage that exposure through their existing prudential frameworks.