Financial markets are underestimating the economic risks posed by biodiversity loss, putting countries at risk of sovereign debt crises and higher borrowing costs, according to new research published in June 2026 [1, 2]. The study introduces the world's first biodiversity-adjusted sovereign credit ratings model to capture these emerging risks [1, 2].

Current sovereign credit rating frameworks largely ignore environmental degradation, risking the mispricing of around $83 trillion in global assets [1, 2]. If key ecosystems such as wild pollinators, marine fisheries, and tropical forests suffer partial collapse, annual global sovereign debt interest payments could rise by $162 billion [1, 2]. Ecosystem disruptions that undermine crop pollination and seafood production could reduce global GDP by about $2 trillion each year [1, 2].

The research projects severe credit rating downgrades under biodiversity loss scenarios for major economies. India could see its sovereign rating fall by four notches and China’s by more than five on a 20-point scale [1, 2]. These downgrades would increase annual debt interest costs by approximately $50 billion for India and $70 billion for China [1, 2]. Other countries such as Indonesia, Bangladesh, and Malaysia face potential rating drops of four to six notches [1, 2].

Across 23 studied countries home to 5.5 billion people, biodiversity-driven rating downgrades could push many nations closer to sovereign default [1, 2]. Such sovereign credit shocks could ripple through domestic economies, affecting businesses, financial institutions, and pension funds [1, 2].

"Financial markets are effectively blind to nature-related risks," said Matthew Agarwala of the University of Sussex. He warned that as biodiversity loss undermines economic performance, countries may struggle to service their debts, raising borrowing costs and fiscal strain [1]. Pati Klusak from Edinburgh Business School added, "The 2008 global financial crisis showed what happens when markets ignore emerging threats. We risk repeating that mistake if ecological risks remain excluded from credit assessments" [1].

The research was first published on June 5, 2026, followed by media reports highlighting the underestimated economic risks from biodiversity loss and its potential to trigger sovereign debt crises the next day [1, 2]. No disagreement was noted between sources.

The study’s findings suggest biodiversity loss should be integrated into sovereign credit rating methodologies soon to better reflect fiscal risks and inform investors and policymakers.