What Is ESG Investing
If you invest in 'good companies,' will returns also be better? ESG investing poses this attractive question, but the answer is more complex and contentious than you'd think.
What Is ESG Investing
ESG investing is a way of choosing investment targets by considering not only financial metrics but also three non-financial factors: Environmental, Social, and Governance.
E refers to environmental impact such as carbon emissions, energy, and pollution; S to social responsibility such as labor, safety, human rights, and community; and G to governance such as board composition, shareholder rights, and transparency.
The starting point is the idea that 'unsustainable companies carry greater long-term risk, so let's examine these factors in advance.'
How Stocks Are Chosen — Screening
The ways ESG indices and funds filter stocks are broadly two.
Negative screening (exclusion): You exclude certain industries entirely, such as tobacco, weapons, fossil fuels, and gambling. This is the oldest and simplest method.
Positive screening (selection): Within each sector, you hold only companies with high ESG scores. It is a 'best-in-class within the sector' method.
Beyond these, there are also methods that integrate ESG factors into financial analysis, concentrate on a specific theme (clean energy, etc.), or directly target social impact.
The Performance Debate — There Is Research on Both Sides
'Does ESG also deliver better returns' is a debate that has not been settled.
One side of research sees ESG funds as similar to conventional benchmarks or ahead in certain stretches. The other side points out that the evidence for excess returns is weak and that results vary greatly by measurement method, period, region, and sector.
In fact, in 2023, as rates spiked, growth stocks (which ESG funds often held) underperformed, while traditional oil and gas companies were strong, causing ESG funds to relatively lag. In other words, ESG neither guarantees returns nor necessarily eats into them.
Performance research yields conflicting results depending on the sample, period, and method. The very fact that it is hard to declare either side the established view is the core of this topic.
Greenwashing and the Criticism of Inconsistent Standards
ESG also faces formidable criticism.
Greenwashing: There have been cases where funds labeled 'sustainable' but actually holding tobacco, weapons, and fossil-fuel companies were caught by regulators. The outer packaging and the inner contents differed.
Score inconsistency: Results differ widely across the rating agencies that assign ESG scores. Much of the data relies on companies' self-reporting and is hard to verify. One study pointed out that ESG scores show a positive correlation with 'apparent environmental performance' but actually a negative correlation with 'actual environmental performance,' suggesting they may be unsuitable as a tool for measuring real impact.
So ESG is an area that should be scrutinized for what is measured and how, rather than accepted on the image of 'good investing' alone.
Frequently Asked Questions
Q. If I do ESG investing, will my returns be higher?
It's uncertain. There is both research finding it similar and research finding the evidence weak, and results are heavily swayed by period, region, and measurement method. When growth stocks underperform — as in 2023 — ESG funds can actually lag. ESG is not a device that guarantees returns.
Q. If a company has a high ESG score, is it really eco-friendly?
Not necessarily. Scores differ across rating agencies, and they often rely on self-reported data. There have been greenwashing cases where a fund was labeled 'sustainable' but held controversial industries, so the score and the actual impact may not match.
Q. So should I not do ESG investing?
It is not a matter of right or wrong but of choice. If your purpose is to reflect your own values in your investing, it has meaning; if you look only at returns, the evidence is not clear. However, you must directly check by what criteria a product was filtered. This article does not recommend any particular product.
📋 Results are based on historical data; past returns do not guarantee future returns.
📋 This service is provided for educational purposes to help you understand investing, not as investment advice.