What Is ESG? - The Specific Content of Three Evaluation Pillars
ESG stands for Environment, Social, and Governance - a framework for evaluating the non-financial aspects of companies. The environmental dimension assesses greenhouse gas emissions, renewable energy usage ratios, and waste management practices. The social dimension covers employee diversity, occupational health and safety, and human rights considerations across the supply chain. The governance dimension emphasizes board independence, executive compensation transparency, and shareholder rights protection. Since the Principles for Responsible Investment (PRI) were established in 2006 with the support of the United Nations Environment Programme Finance Initiative and the UN Global Compact, incorporating ESG into investment decisions has spread among institutional investors worldwide. PRI is not a United Nations body - it is a set of principles developed by investors themselves with UN support.
In Japan, the Government Pension Investment Fund (GPIF) adopted ESG indices in 2017, and that move helped spread the practice of incorporating ESG considerations into asset management domestically. For individual investors as well, the ESG perspective serves as a valuable tool for assessing companies' long-term risks and growth potential.
How ESG Scores Work - Differences and Limitations Across Rating Agencies
ESG scores are calculated by multiple rating agencies - including MSCI, Sustainalytics, FTSE Russell, and S&P Global - each using their own proprietary methodology. The problem is that scores for the same company can vary significantly across agencies. In an analysis by researchers at the MIT Sloan School of Management (2022) comparing the ratings of six major agencies, correlations between agencies ranged only from 0.38 to 0.71. The same analysis broke the divergence down into differences in measurement (56%), differences in scope (38%), and differences in weighting (6%), which means that even when agencies look at the same company, results shift depending on what is measured and how.
As an investor, rather than relying on a single ESG score, it is important to reference multiple rating agencies and develop your own evaluation criteria. In particular, verify whether the factors emphasized by a rating agency align with your investment philosophy - if you prioritize environmental issues, reference agencies with strong E scores; if governance is your focus, use agencies known for their G score rigor.
ESG Investment Performance - Empirical Analysis of Returns and Risk
Whether ESG investing delivers higher or lower returns compared to traditional investing remains a debated topic in academic research. Reviews that survey a wide range of empirical studies find that a positive correlation between ESG and financial performance is the majority finding, but causation has not been established. Companies with high ESG scores tend to have higher management quality, which may be reflected in financial performance as a result. Conversely, some argue that restricting the investment universe based on ESG criteria can drag down returns. For individual investors, the rational approach is not to use ESG as the sole criterion but to combine it with financial analysis for a comprehensive evaluation.
ESG investing is not merely a trend but is becoming established as an important indicator for measuring corporate risk management capabilities.
Next Actions for Getting Started with ESG Investing
If you are interested in ESG investing, start by clarifying which values matter most to you (environmental, social, or governance). Then compare ESG-focused mutual funds and ETFs. In Japan, the "eMAXIS Japan ESG Select Leaders Index" is one widely known example, and globally the "iShares ESG Aware MSCI USA ETF (ESGU)" is another. These are examples only and are not recommendations of specific products. Review the holdings and ESG criteria of each candidate fund and select those that align with your values.
For individual stock investing, use the free ESG scores available on Yahoo Finance or Morningstar to practice stock selection that combines financial analysis with ESG evaluation. Because research remains divided on how ESG affects returns, treat it not as grounds for expecting extra returns but as an additional analytical tool for assessing the long-term sustainability of companies.