The sustainable investing market has grown from a niche category to a multi-trillion-dollar industry in a remarkably short time, drawing in capital from institutions, sovereign wealth funds and private investors who want their portfolios to reflect their values without sacrificing returns. Alongside this growth has come an equally rapid proliferation of terminology, conflicting rating methodologies, regulatory frameworks and — frankly — marketing claims that do not withstand scrutiny. For HNW investors who take ESG seriously, the challenge is not deciding whether to engage with sustainable investing, but developing the analytical framework to distinguish genuine substance from sophisticated packaging.
Capital is at risk. Past performance is not a reliable indicator of future results. This guide is for information purposes only and does not constitute regulated investment advice.
What ESG Actually Means
ESG stands for Environmental, Social and Governance — three distinct categories of non-financial business characteristics:
Environmental: Carbon emissions, energy use, waste management, water consumption, biodiversity impact, physical climate risk exposure.
Social: Labour standards, worker safety, supply chain practices, community relations, human rights, data privacy and customer protection.
Governance: Board composition, executive pay, shareholder rights, audit quality, anti-corruption standards, transparency of reporting.
ESG analysis is primarily a risk assessment tool: it attempts to quantify whether a company's management of these non-financial factors creates material financial risks or opportunities for investors. A company with poor environmental management may face regulatory penalties, stranded assets or reputational damage. A company with weak governance may be subject to fraud, management failure or regulatory sanction.
ESG is not the same as ethical investing or impact investing, though the terms are frequently conflated:
- Ethical investing excludes sectors (tobacco, weapons, gambling) based on moral judgements
- ESG integration incorporates ESG factors into financial analysis without necessarily excluding industries
- Impact investing actively seeks to generate measurable positive social or environmental outcomes alongside financial returns
ESG Ratings: Why They Disagree So Much
One of the most important things to understand about ESG ratings is that they are not standardised. Major ESG rating agencies — MSCI, Sustainalytics, Refinitiv, ISS and FTSE Russell — frequently reach radically different conclusions about the same company.
A widely cited study by Berg, Kölbel and Rigobon ("Aggregate Confusion", published in the Review of Finance in 2022) found that the average correlation between major ESG ratings was approximately 0.54 — substantially lower than, say, credit ratings from different agencies, which typically correlate at 0.9+. Tesla, for instance, has received sharply divergent ESG assessments: MSCI has rated it as an industry leader (an "A"/"AA"-level rating) while Sustainalytics has simultaneously classified it as "high risk".
Why the disagreement?
Scope differences: Agencies define environmental, social and governance factors differently. Some include product harm in governance; others treat it as social.
Measurement differences: Even when measuring the same variable, agencies use different data sources, assumptions and normalisation approaches.
Weighting differences: How much does carbon emissions data matter relative to executive pay or water use? Each agency answers this differently.
Materiality definitions: Some agencies apply sector-specific materiality (e.g., water stress is more material for a food producer than a software company); others apply uniform scores.
Implication for investors: You cannot assume that any fund labelled "ESG" is genuinely aligned with a specific set of values or objectives. The underlying methodology matters enormously.
Greenwash: What It Looks Like
Greenwashing occurs when environmental or sustainability claims made in marketing materials are not substantiated by the underlying portfolio or strategy. Common forms include:
Label washing: A fund with minimal changes from its conventional equivalent is renamed with "sustainable", "responsible" or "ESG" branding. The holdings may differ only marginally from a standard index fund.
Exclusion-only "sustainability": Excluding tobacco or weapons manufacturers is a minimal screen. It removes a small number of companies but does not ensure the remainder have strong ESG characteristics.
Aggregation masking: A high ESG-score company in one dimension (e.g., good governance) can offset a very poor score in another (e.g., heavy carbon emissions), producing an aggregate "pass" rating that obscures material environmental risk.
Forward-looking claims without accountability: Funds that include oil majors, airlines or cement manufacturers based on their stated transition commitments, rather than their actual current business profile.
Cherry-picked data: Selecting only the most favourable ESG metric to highlight in marketing materials while ignoring adverse scores from other rating agencies.
Regulatory Frameworks: What SFDR Means for Investors
The EU's Sustainable Finance Disclosure Regulation (SFDR), in force since 2021, requires fund managers in the EU to categorise funds into three tiers:
- Article 6: No sustainability characteristics
- Article 8: Products that "promote" environmental or social characteristics (a broad category)
- Article 9: Products with sustainable investment as a core objective, measurable outcomes and transparent reporting
SFDR has not eliminated greenwash, but it has provided a framework for comparison. Several large asset managers downgraded funds from Article 9 to Article 8 in 2022–2023 after regulators increased scrutiny — acknowledging their products did not meet the higher standard their marketing had implied.
In the UK, the Sustainability Disclosure Requirements (SDR) framework and associated labelling regime (introduced by the FCA from 2024 onwards) creates four labels: Sustainability Focus, Sustainability Improvers, Sustainability Impact and Sustainability Mixed Goals. These labels require substantive evidence of the sustainability characteristics claimed.
For internationally mobile investors, the regulatory framework that applies depends on where the fund is domiciled and where you are based. Irish-domiciled UCITS funds are subject to SFDR; UK-domiciled funds to SDR; non-EU/UK funds may have no standardised disclosure requirements.
Identifying Genuine ESG Substance
What to look for in a genuinely ESG-integrated fund:
Disclosed methodology: The fund should explain precisely how ESG factors are integrated — not just say "we consider ESG". Does ESG integration affect stock selection? Position sizing? Is there engagement with company management?
Meaningful exclusions or tilts: Are specific sectors excluded, or are holdings substantially tilted away from the highest-ESG-risk companies? Compare the fund's portfolio carbon intensity to its benchmark — if the difference is minimal, the ESG overlay is cosmetic.
Engagement and stewardship: Genuine ESG investors use their ownership position to engage with company management on ESG improvement. Look for evidence of active stewardship: voting records, published engagement priorities, documented outcomes.
Third-party verification: Does the fund use data from multiple ESG rating sources? Does it commission independent audits of its ESG claims?
Impact versus avoidance: There is an important distinction between avoiding harm (not investing in bad actors) and pursuing positive impact. Be clear which the fund claims to do, and whether it actually delivers.
ESG and Financial Performance
The relationship between ESG and financial returns is contested:
The optimistic view: Well-governed, environmentally efficient, socially responsible companies manage risk better, attract better talent, avoid regulatory penalties, and are better positioned for a low-carbon future — leading to superior long-run returns.
The sceptical view: ESG-integrated portfolios, by restricting the investment universe, sacrifice potential returns from excluded sectors (notably energy companies, which performed exceptionally well in 2021–2023).
The empirical reality: Studies show mixed results. Some ESG integration approaches have delivered modest positive alpha; others have been return-neutral; a minority have underperformed. The answer depends enormously on how ESG is implemented.
As of 2026, ESG investing has been through a significant reputational correction — the energy sector's strong post-COVID performance embarrassed heavily ESG-constrained funds. However, governance factors (which have consistent evidence for improving risk-adjusted returns) remain well-supported across multiple studies.
Practical Guidance
- Treat ESG scores as supplementary input, not investment conclusions
- Read underlying portfolio holdings, not just labels
- Compare portfolio carbon intensity, sector weights and exclusions to benchmarks
- Ask managers for their voting and engagement records
- Distinguish between ESG risk management, ethical exclusion and impact investing — they are different products
How Global Investments Can Help
Global Investments applies ESG factors as a genuine risk management tool across portfolio mandates, without reducing investment quality in the pursuit of sustainability marketing. We work with clients who have specific values-based requirements — whether religious exclusions, fossil fuel avoidance or explicit positive impact goals — and help them distinguish between products that substantiate their claims and those that do not.
Our ESG research process assesses methodology transparency, portfolio holdings, engagement practices and regulatory classification to help clients make genuinely informed decisions in a landscape saturated with conflicting claims.
Contact our advisory team to discuss your sustainable investing objectives and how to integrate them into a robust international portfolio.
Investments can fall as well as rise. ESG characteristics do not guarantee superior financial returns. Regulatory frameworks and ESG methodologies change frequently. Tax rules vary by jurisdiction. This guide does not constitute regulated investment advice.
This guide is for general information only and does not constitute financial advice or a personal recommendation. The value of investments can fall as well as rise and you may get back less than you invest. Past performance is not a guide to future returns. Tax rules, investment regulations, and the availability of specific investment vehicles change — always verify current rules and seek advice from a qualified independent financial adviser before making any investment decisions.