A feasibility study of climate portfolio construction strategies (Annals of Actuarial Science)

Summary

• Global sustainable investment assets surpassed $30 trillion in 2022 based on data from the Global Sustainable Investment Alliance.p.1
• The study evaluates a static portfolio allocation formed in June 2020 with an initial investment of $1,000 through December 2025.p.9
• For the EU STOXX 50 index, 46 stocks were evaluated after removing 4 companies with incomplete historical price data.p.9

Key insights

1. ESG integration effectiveness depends on the portfolio optimization framework, chosen sustainability target, and market characteristics.p.1
2. UNPRI signatories must maintain responsible investment coverage across more than 50% of total assets under management.p.5
3. European firms display a narrower ESG risk distribution with zero companies classified in the High or Severe risk categories.p.11
4. The variance-minimization strategy holds between 3 and 11 assets across feasible target levels in the European market.p.17
5. Applying a Black-Litterman framework prevents extreme single-stock concentration compared to pure return maximization.p.23
6. Primary ESG screening improved risk-adjusted portfolio outcomes in Europe but reduced financial returns in North America.p.27
7. Combining multiple distinct allocation models into an ensemble reduces model-specific error and portfolio concentration risk.p.28