Alexander Wollenweber

Alexander is an Occasional Research Fellow at LSE’s Earth Capital Nexus and Grantham Research Institute, and a PhD candidate at the University of Oxford, Environmental Change Institute. He is a member of the Global Finance and Economy Group at the ECI, and his research focuses on the interplay between climate change, environmental degradation, and the macroeconomy, specifically sovereign debt and international macro-finance.
Background
Previously, he was a fixed-term Economist at S&P Global Ratings, Global Economic Research co-building their nature-related financial risk analysis framework, a Senior Fixed Income Analyst focusing on sovereign debt at the UN Principles for Responsible Investment, and a research assistant at the Grantham Research Institute on Climate Change and the Environment at LSE, working on the role of central banks and sovereign bond portfolios in the context of the climate net zero transition. He began his career in the financial industry as a Climate Finance Research Fellow at Barings Investment Management, Sovereign Debt and Currencies.
Alexander holds a double MSc. (Distinction), in International Political Economy from the LSE and in International Economic Policy from Sciences Po, with a major in quantitative methods, and a BSc. (Distinction) in International Business and Politics from Copenhagen Business School (CBS). His PhD is financially supported by the German Federal Ministry for Research and Education via the Friedrich-Naumann-Foundation.
Research interests
- Global financial system
- Sustainable public finance
- Sovereign debt
- Central banks and other financial institutions
- Climate change risk
- Nature risk
Research
Research - 2026
The first empirical analysis of the financial effects of nature degradation on sovereign bonds, examining borrowing costs across 28 advanced and 25 emerging economies between 2000 and 2020. Read more

Policy
Policy - 2024
Sovereign bonds are central to aligning finance flows with the net zero transition. This report aims to understand the system-wide context within which central banks can make a responsible contribution to this alignment. Read more

News
News - 2026
Coverage of a recent Grantham Institute working paper about how ecosystem decline led to rising bond yields. Read more

Increasing nature degradation has led to higher borrowing costs for governments, according to new research. Read more
