When Climate Finance is Debt: Green Loans, Multilateral Lenders, and Sovereign Risk in Vulnerable African Economies

Climate adaptation and mitigation needs in low‑income countries are large, yet a substantial share of climate finance is delivered as sovereign loans rather than grants. This paper asks whether debt‑financed climate investment can accelerate the green transition without worsening sovereign debt vulnerability in climate‑exposed African economies. We develop a lender–borrower–project framework that links climate-labelled sovereign lending from multilateral development banks (including AIIB and peer institutions) to detailed loan terms (maturity, grace, pricing basis, currency denomination, and concessionality), project objectives (adaptation versus mitigation), climate‑shock exposure, and sovereign risk indicators (spreads, yields, ratings, and debt‑distress assessments). The empirical design addresses the central endogeneity problem, vulnerable countries may both borrow more and face higher risk, by exploiting lender‑side variation in climate mandates and funding conditions, combined with shift‑share exposure measures and event‑time specifications around policy‑based climate financing windows. We synthesise stylised facts that motivate the design: climate finance to Africa is unusually debt‑heavy; climate vulnerability and disasters are priced into sovereign borrowing costs; and non‑concessional green loans can amplify rollover risk in high‑debt settings. We show why instrument design, concessionality, longer maturities, blended finance, and climate‑resilient debt clauses, become the key margin for aligning climate objectives with sovereign solvency.