Sustainable investing is a complex subject. The investing industry, as it always does, has made it even more so. Here is a book that spells out what the data and peer-reviewed academic evidence tell us. The truth is, we simply don’t know whether ESG portfolios will outperform or underperform mainstream portfolios in the future. Ultimately, though, there are far more important things at stake. Adams and Swedroe have produced the go-to guide for anyone who wants to understand the issues involved.