Governments Face Higher Borrowing Rates Without Nature Safeguards: LSE Grantham Study Finds

The LSE Grantham Study Unveils Hidden Financial Risks

The London School of Economics' Grantham Research Institute on Climate Change and the Environment has released a groundbreaking working paper titled "Kicking Away the Green Ladder: The Asymmetric Sovereign Risk from Nature Degradation." Published on March 6, 2026, this is the first empirical analysis demonstrating how biodiversity loss and nature degradation directly elevate government borrowing costs through sovereign bond yield spreads.

Authored by Alexander Wollenweber, Dieter Wang, and Nicola Ranger, the study examines data from 53 countries—including numerous European nations—spanning 2000 to 2020. It reveals that governments failing to safeguard natural ecosystems face a borrowing penalty of 40 to 75 basis points (bps) on shorter-term bonds (2- and 5-year maturities), equivalent to higher interest payments that strain public finances.

This penalty arises because investors price in the economic fallout from ecosystem collapse, such as disrupted agriculture, reduced pollination services, and heightened disaster vulnerability, which hit fiscal revenues and amplify debt burdens. For Europe, where advanced economies like Germany, France, and Italy are part of the sample, the findings underscore indirect risks through global supply chains even as direct penalties are lower compared to emerging markets.

Understanding Nature Degradation and Sovereign Debt Linkages

Nature degradation refers to the deterioration of ecosystems, biodiversity loss, and transgression of planetary boundaries like biospheric integrity, now exceeded in two-thirds of global land areas. Half of global GDP depends on ecosystem services—pollination, soil fertility, water regulation, and hazard protection—making them foundational to economic stability.

In Europe, the continent hosts critical biodiversity hotspots, yet faces acute pressures from urbanization, agriculture intensification, and climate-amplified events. The European Environment Agency notes that 81% of EU habitats and 63% of species are in poor or bad conservation status, amplifying vulnerabilities. Sovereign debt, comprising over 50% of global debt securities, becomes riskier as degradation triggers fiscal shocks: lower tax revenues from agriculture (a key sector in southern Europe), higher disaster reconstruction costs, and contingent liabilities from ecosystem service failures.

The study's innovation lies in quantifying these through sovereign bond yield spreads—the premium over risk-free US Treasuries—revealing market anticipation of nature-related fiscal stress.

Methodology: Rigorous Empirical Approach

The researchers employ panel interactive fixed effects (IFE) models and quantile regressions on quarterly data for 2-, 5-, and 10-year bond maturities. The sample includes 28 advanced economies (e.g., Austria, Belgium, France, Germany, Italy, Netherlands, Spain, Sweden, UK) and 25 emerging/developing ones (e.g., Poland, Romania).

• Nature Proxies: Biodiversity Intactness Index (BII), Biodiversity Habitat Index (BHI), Environmental Performance Index Biodiversity & Habitat subindex (EPI BDH)—inverted for vulnerability.
• Controls: Debt-to-GDP, primary balance, inflation, GDP growth, rule of law, financial depth.
• Models: IFE accounts for unobserved global factors (1-2 latent factors); quantile IFE reveals heterogeneity across risk levels.

Robustness checks include lags, dynamic panels, and comparisons to climate vulnerability (ND-GAIN index), confirming nature risks' independent, macrocritical role.

Key Findings: Quantified Borrowing Penalties

Core result: Higher within-country biodiversity degradation correlates with elevated spreads. For BHI proxy, a unit increase links to ~40 bps penalty on 5-year bonds and ~70 bps on 2-year—peaking at shorter horizons due to acute fiscal pressures.

Quantile analysis exposes asymmetry: At the 90th percentile (high-risk sovereigns), penalties triple to 75 bps, versus 25-40 bps at median. European advanced economies cluster at low quantiles (e.g., Germany, Netherlands), facing minimal direct hits but spillover risks from EMDE trade partners.

Comparisons: Nature effects rival climate vulnerability (ND-GAIN ~68 bps on 5-year), with within R² of 0.75 indicating strong explanatory power post-controls.

Photo by Val Do on Unsplash

European Governments in the Spotlight

Europe's inclusion—19 countries from the sample—highlights nuanced risks. Southern peripherals (Greece, Italy, Portugal, Spain) show higher baseline spreads, vulnerable to degradation via tourism, agriculture (olive groves, vineyards), and wildfires eroding soils. Northern leaders (Denmark, Sweden, Finland) benefit from strong environmental performance but import risks from global commodities.

ECB analyses corroborate: 72% of euro area firms exposed to ecosystem degradation, transmitting to sovereigns via banking channels and fiscal backstops. ABN AMRO models project climate disasters widening EU fiscal deficits by 0.5-1% GDP, nudging yields up.

EU Policy Responses: Nature Restoration and Green Finance

The EU Nature Restoration Law (2024) mandates ecosystem recovery targets—30% land/sea protection by 2030—aligning with Kunming-Montreal Framework. Yet, implementation via National Restoration Plans (due 2026) faces fiscal hurdles; non-compliance risks transition penalties on bonds.

Positive: Sovereign green bonds surged, with EU Green Bond Standard (EuGBS) enabling €22bn issuance in 2025. France plans record 2026 greens; KfW eyes €15bn. These offer greeniums (lower yields) for nature-aligned spending, countering degradation penalties.

EU Green Week 2026 theme: "Investing in a Nature-Positive Economy," convenes policymakers on blending public-private funds.Learn more on EU Green Week

Case Studies: Lessons from European Vulnerabilities

Italy: Biodiversity hotspots like Alps face habitat loss; degradation could add 20-50 bps to yields amid high debt (140% GDP). Spain's droughts erode pollination, hitting €15bn olive sector.

Greece post-fires: Reforestation lags, amplifying spreads during debt restructurings. Conversely, Sweden's intact forests buffer risks, exemplifying safeguards' value.

Cross-border: Germany's manufacturing imports African commodities; LSE notes cascades via supply chains.

Stakeholder Perspectives and Challenges

Authors warn: "High-income countries are unlikely to be insulated, as effects can cascade via interconnected supply chains." ECB echoes: Nature risks undermine productivity, disrupt chains.

Challenges: Data gaps on nature metrics; short-termism in bond markets; political resistance to restoration costs. Solutions: Mandate nature disclosures in debt analyses (IMF/World Bank), incentivize via SLBs.

Photo by DJ Paine on Unsplash

• Integrate into Debt Sustainability Frameworks.
• Boost green bond taxonomies for biodiversity.
• Public-private blends for restoration.

Future Outlook: Pathways to Resilience

Projections: Without action, penalties compound with climate risks, potentially 100+ bps for peripherals by 2030. Optimistic: Reversing degradation via EU law could yield 20-50 bps savings, freeing €billions for green transitions.

Horizon: EU's €1tn+ sustainable debt pipeline, NGFS nature scenarios. Academic research surges; opportunities in sustainability finance abound.Discover research positions in environmental economics.

Actionable Insights for Policymakers and Investors

Prioritize: (1) National Restoration Plans with fiscal modeling; (2) Issue biodiversity-linked bonds; (3) Collaborate on TNFD disclosures. Investors: Screen sovereigns via BII/BHI; favor greens. For Europe, leveraging EuGBS positions leaders in nature-positive finance.Career advice for sustainability experts.

Read the full LSE working paper (PDF)

As nature risks materialize, proactive safeguards aren't optional—they're fiscal imperatives. Explore Rate My Professor for insights from leading academics or higher-ed jobs in this field.