"Worldwide pension funds, in their capacity as large institutional investors, are under increasing pressure to take social and environmental considerations into account in their investment decision-making process. The concepts Socially Responsible Investment (SRI) and Environmental Social Governance (ESG) are indeed ubiquitous in the current investment and pension community. This article aims to provide some insight into the conceptual relationship between SRI and ESG and its legal implications for the investment behaviour of private pension funds in the USA and the EU. Hence, the first part of the article gives some background to the distinct concepts of SRI and ESG. This leads to the finding that SRI goes one step further than ESG by prioritising moral or ethical considerations that may not be material to an investment's financial performance, whereas ESG functions as a guideline to enhance financial performance. The second part analyses the legal possibilities and constraints for responsible investment in American occupational pensions and the third part does the same for European occupational pensions. The article concludes with a summary and comparative overview of the American and European lessons."

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