国际清算银行-解读主权债券定价中的气候相关风险_全球视角（英）-2025.7_52页_1mb

Summary of "Decoding climate-related risks in sovereign bond pricing: A global perspective"

I. Main Findings

• Transition Risk
  • Sovereign bond yields, especially in developing countries, show a positive correlation with carbon dioxide (CO₂) emissions per capita, reflecting higher financing costs during the climate transition.
  • High-emitting countries after the Paris Agreement face stateprice increases in sovereign yields, emphasizing the financial-market pricing of transition risks.
• Physical Risks
  • Short-to-medium-term effects from acute physical risks (e.g., natural disasters) emerge only under specific conditions, such as high debt levels in developing economies.
  • Chronic physical risks (temperature changes) do not significantly influence sovereign yields in the long term, suggesting underpricing of such risks.
• Heterogeneity
  • Advanced economies respond less abruptly and exhibit prolonged effects from extreme temperature and storm events, while developing countries show immediate and severe impacts due to fiscal constraints.
  • The impact of climate shocks varies by disaster type, with droughts causing the largest yield increases in both groups of countries.
• Fiscal and Debt Context
  • High-debt countries and those with low fiscal space face amplified borrowing costs following climate shocks, potentially triggering debt sustainability concerns.
  • Natural disasters indirectly increase sovereign risks through mechanisms like reduced growth and fiscal strains, but not explicitly as physical climate risk premiums.

II. Methodology

• Empirical Approach
  • Panel Regressions: Used climate risk variables (transition, chronic, acute) across 52 countries (2000–2023), controlling for macroeconomic and institutional factors.
  • Local Projections (LP): Analyzed medium-term effects of disasters, revealing differential responses across income groups and disaster types.
• Data Used
  • BIS-classified development groups, CO₂ emissions, temperature indices, EM-DAT disaster data, and control variables (debt, GDP growth, fiscal space indicators).

III. Policy Implications

• Policymakers should prioritize managing transition risks (via green finance policies) in low-income/emission countries to mitigate higher borrowing costs.
• Recognizing acute physical risks' heterogeneity is crucial for resilience strategies, especially in developing economies vulnerable to natural disasters exacerbated by climate change.
• International collaboration is needed to address the "climate debt trap," linking climate and debt policies for stabilized sovereign finance.

IV. Key Caveats

• The study suggests that climate misinformation or undervaluation is not reflected in sovereign pricing for acute physical risks.
• Increased reliance on stochastic models like DSA may help integrate climate risks systematically into macroeconomic and fiscal frameworks.