For the past decade, climate change has dominated the conversation around environmental financial risk. Carbon emissions are measurable, climate scenarios are modellable, and disclosure frameworks like TCFD have given institutions a shared language. But a parallel crisis—arguably more complex and potentially more disruptive—has been gathering force in the background.

More than half of global GDP, roughly $44 trillion, depends on nature and ecosystem services to some degree. Pollination, water filtration, soil fertility, coastal protection—these aren't abstract environmental concerns. They are inputs to economic production, and they are deteriorating at an unprecedented rate. The World Economic Forum now ranks biodiversity loss among the top five global risks by severity.

Financial institutions and regulators are beginning to ask a question that would have seemed peripheral just five years ago: what happens to balance sheets when the ecosystems underpinning economic activity begin to fail? The answer is reshaping how we think about materiality, risk assessment, and the boundaries of financial analysis itself.

Every business sits within a web of ecosystem dependencies, whether it recognises them or not. Agriculture depends on pollination and soil health. Pharmaceuticals rely on genetic resources. Real estate values hinge on flood regulation and water availability. These dependencies are so deeply embedded in economic activity that they've historically been treated as free and infinite. They are neither.

The concept of ecosystem services—the benefits that natural systems provide to economic actors—offers a framework for making these dependencies visible. When a company sources raw materials from a region experiencing deforestation, or operates in a watershed under stress, it carries nature-related financial exposure. That exposure can manifest as supply chain disruption, increased input costs, regulatory action, or stranded assets.

But dependency is only half the equation. Companies also impact biodiversity through pollution, land-use change, resource extraction, and emissions. These impacts create feedback loops: a firm that degrades the ecosystem it depends on is effectively undermining its own future cash flows. And in an increasingly regulated environment, those impacts carry litigation risk and reputational exposure that investors cannot afford to ignore.

The analytical challenge is mapping these dual channels—dependency and impact—across complex value chains with geographic specificity. Unlike carbon, which can be reduced to a single metric (tonnes of CO₂ equivalent), biodiversity risk is inherently place-based and multi-dimensional. A factory's water usage matters very differently in Scotland than in Rajasthan. This context-dependence makes standardised assessment harder, but it also makes ignoring the risk more dangerous.

Takeaway

Nature isn't an externality—it's an input. Any financial exposure analysis that treats ecosystem services as free and permanent is systematically underpricing risk.

The Taskforce on Nature-related Financial Disclosures (TNFD) launched its final recommendations in September 2023, modelled deliberately on the climate-focused TCFD framework. The logic is straightforward: if markets learned to price climate risk through standardised disclosure, the same architecture can be extended to nature. TNFD provides a structure for organisations to report on their nature-related dependencies, impacts, risks, and opportunities across four pillars—governance, strategy, risk management, and metrics.

At the core of TNFD sits the LEAP approach—Locate, Evaluate, Assess, Prepare. This methodology guides organisations to first identify where their interfaces with nature occur (including upstream and downstream), then evaluate their dependencies and impacts, assess material risks and opportunities, and finally prepare disclosure and response strategies. The geographic specificity is intentional. Nature risk cannot be assessed in the abstract.

Several complementary tools are emerging alongside TNFD. The ENCORE database maps economic sectors to their ecosystem service dependencies. The Science Based Targets Network (SBTN) provides methodologies for setting measurable nature targets. The EU's Corporate Sustainability Reporting Directive now includes biodiversity disclosure requirements. Together, these create an ecosystem of frameworks that is maturing rapidly, even if unevenly.

Early adoption is concentrated in sectors with obvious nature exposure—agriculture, mining, food and beverage—but financial institutions are increasingly expected to assess nature risk across their portfolios. Central banks in the Netherlands and France have already conducted exploratory assessments of nature-related financial risk in their banking sectors. The direction of travel is clear: what was voluntary yesterday becomes expected today and mandatory tomorrow.

Takeaway

TNFD and its companion frameworks aren't just reporting standards—they are forcing functions that make invisible dependencies visible and unmeasured risks measurable for the first time.

If climate risk assessment is hard, biodiversity risk assessment is harder by an order of magnitude. Climate change can be modelled through a relatively small number of variables—greenhouse gas concentrations, temperature pathways, transition policy scenarios. Biodiversity loss involves thousands of interacting species, ecosystems, and ecological thresholds, many of which are poorly understood and non-linear in their behaviour. An ecosystem can appear stable until it collapses suddenly.

Data availability remains the most immediate obstacle. While satellite imagery, environmental DNA sampling, and remote sensing are improving rapidly, granular biodiversity data at the asset or supply-chain level is still scarce and inconsistent. Companies often lack visibility into the ecological conditions of their sourcing regions, and the metrics that do exist—species richness, ecosystem intactness, water stress indices—don't translate easily into financial terms.

There is also a conceptual challenge. Climate risk can be decomposed into transition risk and physical risk with relatively clear transmission mechanisms to financial statements. For biodiversity, the transmission pathways are more diffuse. How exactly does pollinator decline in a sourcing region affect a food company's five-year earnings forecast? The causal chains are real but long, tangled, and dependent on tipping points that are difficult to predict.

Pragmatic approaches are emerging despite these difficulties. Sector-level materiality screening can identify where nature risk is most concentrated. Scenario analysis, even if qualitative, can stress-test portfolios against plausible ecological disruptions. And the integration of nature risk into existing enterprise risk management systems—rather than treating it as a standalone ESG exercise—ensures it receives the strategic attention it warrants. Perfection is not the standard. Informed approximation beats wilful blindness.

Takeaway

Biodiversity risk is messier than climate risk, and waiting for perfect data is itself a risk. The institutions that build assessment capacity now—however imperfect—will be better positioned than those that wait for certainty that may never come.

The financial system spent roughly a decade building the infrastructure to understand and price climate risk. Nature risk is following the same trajectory, but on a compressed timeline and with greater underlying complexity. The frameworks exist. The regulatory signals are clear. The question is no longer whether biodiversity loss is financially material—it is whether institutions will act on that materiality before ecological thresholds force the issue.

This is not a niche concern for sustainability teams. It is a core risk management challenge that touches lending, insurance, asset valuation, and sovereign creditworthiness. The dependencies are real, the deterioration is measurable, and the frameworks for action are available.

The frontier is open. The cost of crossing it late will be considerably higher than the cost of crossing it now.