Ecological debt could expose the true cost of environmental damage

Environmental damage is often measured through scattered indicators: hectares of forest lost, species counts, tonnes of pollutants or the short-term costs of restoration. A proposed accounting system would add something more direct to the dashboard: a monetary estimate of what governments, companies and communities would have to spend to bring ecosystems back to agreed reference levels. The approach, described by researchers in One Ecosystem, could make ecological degradation visible alongside economic performance in budgets and sustainability dashboards, while also revealing who is responsible for accumulated damage.

The central idea is an ecological debt built from the cost of preventing further degradation and restoring ecosystems that have already deteriorated. The authors distinguish this from a damage-based method, which values lost or diminished benefits such as reduced water quality, pollination or recreation. Restoration-cost accounting instead asks how much expenditure would be required to move ecosystem extent and condition from their present state to an environmental target. That difference turns the concept of debt into an action-oriented estimate: it identifies the cost of closing a gap rather than attempting to place an uncertain price on every ecological benefit.

That distinction matters because estimating the lost value of ecosystem services requires assumptions about future benefits, risk, preferences and even the preferences of future generations. It also relies on a causal chain from pressure to ecological change to human welfare, a sequence that can break down in nonlinear systems. The cost-based alternative starts from measures whose effects and expenses can be modelled, compared or documented, including wetland restoration, reductions in fishing mortality, protection of habitats and changes in agricultural practices. Yet its credibility still depends on transparent targets, comparable estimates and regular revision as technology, prices and ecological knowledge change.

Two routes are proposed for estimating the national figure. Technico-economic models combine databases of possible interventions, their costs and their expected effects, adding measures from least to most expensive until a target is met. Macroeconomic models represent how financial effort changes pressures and eventually ecological outcomes through dose-response relationships. Both are vulnerable to uncertain market conditions, incomplete data and non-linear ecosystem responses, particularly where several drivers interact. The authors therefore advocate comparison among models and frequent updates, drawing on the practice used in climate analysis. A separate accounting route would compile prevention and restoration costs recorded by companies, households and governments, potentially drawing on sustainability reporting and environmental impact assessment.

The accounting route would distinguish liabilities that can be attributed to identifiable entities from broader modelled estimates relevant to policy. In a design analogous to national economic accounting, changes in the ecological debt could separate degradation caused by economic activity, such as removing a hedge or revegetating a damaged site, from changes caused by events such as hurricanes. Revisions to reference targets, improvements in scientific methods and shifts in prices or restoration technology would also need their own categories. This structure would make clear whether a rising debt reflected more damage, a more ambitious target, better information or higher prices, preventing the headline total from becoming an ambiguous verdict on national progress.

Reference levels are the system’s most politically sensitive component. International statistical guidance generally recommends using natural conditions as a benchmark so that ecosystem accounts remain separate from policy preferences. Yet a cost can represent an ecological debt only if society has committed to maintaining or restoring a particular condition. The paper therefore distinguishes scientific environmental limits, political targets and administrative norms. Scientists identify thresholds associated with risk, public institutions negotiate targets that balance ecological and social considerations, and governments translate those commitments into enforceable rules. Ecosystem accounts can feed into this iterative process by showing the measures and costs required to meet each target and by revealing where deadlines, ambition or implementation fall short.

To decide which ecological features should be monitored, the researchers organize ecosystem condition around three categories. Heritage dimensions capture features valued for non-use or intrinsic reasons, such as distinctive habitats or culturally important landscapes. Use dimensions measure the capacity of ecosystems to provide services sustainably, including fisheries, carbon storage, water regulation and pollination. Functionality dimensions concern the overall operation, resilience and adaptive capacity of ecosystems, even when no single service is identified. The structure prevents one definition of value from automatically dominating the accounts and links every indicator to the reasoning behind the target it supports. It also helps reconcile different values without forcing unlike monetary quantities to be added together.

The proposal is especially relevant as governments confront pressures on biodiversity, climate and water while conventional indicators such as gross domestic product largely ignore the natural systems that sustain economies. A well-designed ecological debt account could channel valuation toward solutions, reveal the long-term expense of delayed action and give budgetary discussions a common language. Its wider value, however, may lie in the information system behind the headline number: standardized spatial data, consistent monitoring, explicit targets, documented liabilities and periodic scientific review. Such a system could connect environmental accounts to policy design, but the authors caution that the accounts would have little influence unless governments, businesses, scientists and communities help define their purposes and use them in real decisions.

Important technical questions remain, including how to define reference conditions, compare ecosystem types, attribute changes and determine which costs belong in the indicator. A restoration budget is not automatically a complete measure of degradation, and an ambitious target may produce a large liability for reasons that differ from fresh ecological damage. For the approach to earn trust, institutions would need to document methods, expose uncertainty and avoid presenting a modelled aggregate as if it were a directly observed debt. Even with those challenges, the proposal offers a potentially powerful shift in environmental measurement: instead of merely documenting what has been lost, accounting for ecological debt would quantify the price of the actions required to repair nature, making the consequences of postponing restoration financially visible.

Subject of Research: Cost-based ecosystem accounting for measuring ecological debt

Article Title: Defining ecological liabilities and structuring ecosystem accounts to support the transition to sustainable societies

Article References: Kervinio, Y., Surun, C., Comte, A., & Levrel, H. (2023). Defining ecological liabilities and structuring ecosystem accounts to support the transition to sustainable societies. One Ecosystem, 8, Article e98100. https://doi.org/10.3897/oneeco.8.e98100

Image Credits: AI Generated

DOI: 10.3897/oneeco.8.e98100

Keywords: ecological debt, ecosystem accounting, ecosystem condition, environmental restoration, sustainability indicators, SEEA-EA, biodiversity monitoring, environmental policy, natural capital, sustainable societies, Defining, ecological