Fitch’s message is clear: climate risk is no longer a distant tail risk. It is becoming a core credit consideration for sovereigns worldwide.
Fitch Ratings has signalled that climate change is set to become a major factor in sovereign credit ratings over the coming decades. In a special report, the agency introduced its new Climate Vulnerability Signals (Climate.VS) screening tool, which quantifies potential exposure to climate-related risks on a 0-100 scale for the period 2030-2050. The findings indicate that around half of Fitch-rated sovereigns could face rating pressure by mid-century, with impacts accelerating sharply after 2035.
Climate Vulnerability Signals: A New Screening Tool
Fitch developed Climate.VS to identify sovereigns whose credit profiles may be materially affected by climate factors beyond the typical short- to medium-term rating horizon. The score reflects potential exposure to both physical risks (extreme weather, sea-level rise, heatwaves) and transition risks (declining demand for fossil fuels, policy shifts toward net zero).
A score of 50 or higher signals that climate-related factors could be material enough to contribute to a downgrade. A score of 70 or above indicates potential for a three-notch downgrade. The tool does not automatically change ratings but flags countries for deeper analysis, taking into account mitigation, adaptation, technological progress, and the actual trajectory of global warming.
Half of Rated Sovereigns at Risk of Downgrade by 2050
By 2050, approximately 50 per cent of Fitch-rated sovereigns are projected to have a Climate.VS of 50 or higher, meaning climate risks could become sufficiently material to pressure ratings downward. Only 6 per cent reach a score of 70, implying a potential three-notch downgrade in the most severe cases.
These highly exposed sovereigns include major fossil-fuel exporters facing revenue collapse as global demand for oil, gas, and coal declines, as well as small nations highly vulnerable to physical risks such as rising seas, storms, and flooding. Fitch notes that actual rating impacts will depend on how aggressively governments adapt, how quickly technology evolves, and the ultimate extent of climate change itself.
Near-Term Risks Limited, But Acceleration Expected Post-2035
To 2035 – the timeframe most relevant for near-term rating actions – only 7 per cent of the rated portfolio registers a Climate.VS of 50 or higher, suggesting limited immediate pressure on sovereign creditworthiness. However, Fitch expects risks to build rapidly and substantially between 2035 and 2050.
Key drivers include accelerating global temperature rise, more frequent and severe extreme weather events, and the structural decline in fossil-fuel demand as the world shifts toward renewables. Sovereigns already experiencing rising costs from disasters, insurance gaps, and adaptation spending will face growing fiscal strain, especially if policy responses remain inadequate.
Most Exposed Countries and Implications for Global Finance
Fitch has identified a small group of sovereigns with Climate.VS scores of 70 by 2050, including Angola, the Bahamas, Gabon, Iraq, the Maldives, Mozambique, and the Republic of Congo. These nations combine heavy dependence on fossil-fuel exports with acute physical vulnerability (small island states) or limited fiscal capacity to adapt.
An earlier related Fitch analysis using its Sovereign Climate Vulnerability Index (SCVI) flagged 23 out of 125 rated sovereigns as highly vulnerable, with small island developing states and frontier markets particularly at risk of fiscal pressures from repeated recovery and adaptation costs. Advanced economies generally have greater buffers to absorb decarbonisation costs, while emerging markets face sharper trade-offs between growth, energy access, and emission reduction targets.
Climate Risk is no Longer a Distant Tail Risk
The agency emphasises that sovereign ratings have so far remained resilient, but this could change as climate shocks translate into sustained output losses, fiscal weakening, or political instability. Longer-term investors are already incorporating these signals into portfolio decisions; ESG mandates and perceptions of transition risk will increasingly influence funding costs and capital flows.
Fitch’s message is clear: climate risk is no longer a distant tail risk. It is becoming a core credit consideration for sovereigns worldwide. Countries that act early to diversify economies, strengthen resilience, and secure international support for adaptation will be better positioned to protect their credit standing. Those that delay face mounting pressure on borrowing costs and economic stability in the decades ahead.
