The Green Premium: Quantifying the Long-Term ROI of SDG-Aligned Capital Investments

Abstract

This paper investigates the existence of a measurable and persistent return premium for capital portfolios explicitly geared towards the UN Sustainable Development Goals (SDGs) compared to conventional benchmarks. We use ten years of annualised performance data (2013-2023) from six economies (Germany, Denmark, China, US, Brazil and Kenya) to draw a cross-national empirical comparison of SDG-aligned and conventional asset classes, such as green bonds, offshore wind infrastructure, ESG equity products and forestry REDD+ investment products. After risk-adjustment, our analysis estimates a strong, asset-type and political-jurisdiction independent ‘green premium' of +2.2 percentage points per year. We embed these findings within the existing literature on ESG alpha, cost-of-capital reduction as well as climate-adjusted version of the DCF model and recommend an architectural model for institutionalising SDG-aligned capital allocation. The findings undermine the prevalent story of a sustainability performance relationship and have implications for pension fund trustees, sovereign wealth managers, and emerging-market development banks.