The three pillars
Environmental factors include carbon emissions, energy efficiency, water use, waste management, and exposure to climate transition risk. Social factors cover labour practices, supply chain standards, community relations, data privacy, and diversity. Governance factors look at board composition and independence, executive pay, shareholder rights, audit quality, and anti-corruption practices. Governance has the longest track record as an investment factor — companies with weak governance (entrench management, poor oversight) have historically generated worse risk-adjusted returns, and this link is well-documented.
Does ESG outperform financially?
The evidence is mixed and context-dependent. ESG funds outperformed during 2020–2021 partly because they overweighted tech (high ESG scores) and underweighted energy (low ESG scores). The reverse occurred in 2022 when energy surged and tech fell. Over longer periods, studies show mixed results: some find a small positive ESG premium (related to governance quality), others find no significant difference, and some find underperformance from the concentration and exclusion effects. The honest answer: ESG investing does not reliably outperform or underperform the market over most time periods.
Does ESG make a real-world impact?
The impact question is even more contested. Selling shares in a coal company doesn’t reduce coal extraction — someone else buys those shares. The real-world impact of portfolio exclusion is primarily through two channels: the cost of capital (if enough investors avoid a sector, it becomes more expensive for those companies to raise capital, potentially constraining investment) and engagement (large institutional shareholders using their voting power and influence to push for change). The first channel may matter marginally; the second has more empirical support.
“ESG investing is better understood as a risk management framework than as a moral statement. The governance part especially has a real return track record. The E and S are murkier.”
What this means for you
If your primary motivation is returns, ESG integration adds information but doesn’t reliably add alpha. If your motivation is values alignment — you simply don’t want to own tobacco or arms manufacturers — negative screening achieves that clearly. If you want real-world impact, direct engagement with companies (only available at institutional scale) or green bonds (financing specific environmental projects) are more direct instruments than portfolio exclusion. Whatever approach you take, scrutinise ESG fund labels carefully: many have a narrow exclusion list and still hold large oil majors, banks financing fossil fuels, and companies with questionable labour practices.