ESG and Sustainable Investing

ESG stands for Environmental, Social, and Governance — three categories of non-financial criteria used to evaluate companies beyond their financial performance. ESG investing incorporates these factors into portfolio construction, either by excluding companies that score poorly, overweighting those that score well, or engaging with companies as active shareholders to improve their practices.

Pillar	What It Covers	Example Metrics
Environmental (E)	Company's impact on the natural environment	Carbon emissions, water usage, waste management, deforestation, energy efficiency
Social (S)	Company's relationships with employees, communities, and supply chain	Labor practices, employee safety, diversity and inclusion, human rights, data privacy
Governance (G)	How the company is led and controlled	Board independence, CEO-pay ratio, accounting transparency, shareholder rights, anti-corruption policies

ESG is not a monolithic strategy. Approaches range from negative screening (exclude tobacco, weapons, fossil fuels) to positive screening / best-in-class (hold the top ESG scorers in each industry) to impact investing (direct capital toward measurable social/environmental outcomes) to shareholder engagement (vote proxies and file resolutions to change company behavior).

Tip: If you want to align your portfolio with your values, be specific about what you want to avoid or support. "ESG" is a broad label — a fund focused on governance quality looks very different from one that excludes all fossil fuel companies. Read the fund's methodology before investing.

ESG ratings are produced by specialized data providers — MSCI, Sustainalytics, S&P Global (formerly RobecoSAM), and Bloomberg are the largest. Each provider uses its own data sources, weighting methodology, and scoring framework, which leads to surprisingly low correlation between their ratings for the same company.

Rating Provider	Scale	Primary Methodology	Coverage
MSCI ESG	AAA to CCC (7 levels)	Industry-specific key issues; relative within industry	14,000+ companies
Sustainalytics (Morningstar)	0–100 risk score (lower = better)	ESG risk exposure and management assessment	16,000+ companies
S&P Global ESG Score	0–100	CSA questionnaire + public data	7,000+ companies
Bloomberg ESG Disclosure Score	0–100	Disclosure quality, not performance	11,000+ companies

A landmark 2019 study by Berg, Kölbel, and Rigobon found the average correlation between ESG ratings from different providers was only 0.54 — compared to 0.99 for credit ratings. The same company can be rated AAA by MSCI and score poorly at Sustainalytics because they measure fundamentally different things.

Warning: ESG ratings measure company disclosure and risk management processes — not actual real-world outcomes. A company can score highly on ESG by publishing detailed sustainability reports while continuing to emit large quantities of carbon. High disclosure ≠ good behavior.

ESG ETF assets have grown from under $50 billion globally in 2015 to over $500 billion by 2024. The range of products is wide — from broad ESG indexes that slightly tilt away from the worst offenders to strict exclusion funds that eliminate entire industries.

Fund	Ticker	Expense Ratio	Approach	What's Excluded
iShares MSCI USA ESG Select ETF	SUSA	0.25%	Best-in-class ESG within each sector	Controversial weapons, tobacco
Vanguard ESG US Stock ETF	ESGV	0.09%	Broad ESG screen, low cost	Fossil fuels, weapons, tobacco, gambling, alcohol, adult entertainment
Parnassus Core Equity Fund	PRBLX	0.82%	Active ESG stock selection	Tobacco, weapons, significant fossil fuel exposure
SPDR S&P 500 Fossil Fuel Reserves Free ETF	SPYX	0.20%	S&P 500 minus fossil fuel reserve owners	Companies with proven fossil fuel reserves

• ESG ETFs tend to have lower weights in energy, tobacco, defense, and materials — sectors that are cyclically strong during inflationary periods. This is the structural reason ESG funds lagged in 2022.
• ESG ETFs also tend to overweight technology, healthcare, and financial services — which drove their outperformance from 2018 to 2021.

Tip: Low-cost ESG ETFs like ESGV (0.09%) impose only a small premium over comparable non-ESG funds like VTI (0.03%). If values alignment matters to you, this small cost difference is arguably worthwhile. Compare to actively managed ESG funds charging 0.50–1.00%+ where the cost hurdle is much harder to justify.

ESG performance relative to the broad market has been period-dependent and driven largely by which sectors the ESG screens over- or underweight. There is no consistent, statistically significant return premium for ESG investing — nor a consistent penalty.

Period	MSCI World ESG Leaders	MSCI World (all stocks)	Driver of Difference
2015–2019	+8.7% annualized	+8.7% annualized	Roughly in line
2020	+20.3%	+15.9%	ESG: tech heavy; COVID favored tech
2021	+21.5%	+21.8%	Near parity
2022	−18.5%	−17.7%	ESG: underweight energy (which rose 58%)
2023	+24.2%	+23.8%	Near parity

An important academic finding: research by Pastor, Stambaugh, and Taylor (2021) suggests that rising ESG demand can mechanically boost ESG asset prices, creating a temporary premium. Once ESG preferences are fully priced in, the premium disappears — ESG assets may even underperform if ESG investors accept lower expected returns as a "values dividend."

Warning: Studies showing strong ESG outperformance often cover only 2015–2021, a period when ESG screens happened to align with the broad market's tech dominance. This is not a permanent structural advantage — it reflects sector composition, not ESG characteristics per se.

Greenwashing is the practice of overstating or misrepresenting the environmental or social credentials of a product, fund, or company. It has become pervasive in ESG investing as asset managers seek to capture the fast-growing ESG fund category without making fundamental changes to their portfolios.

Greenwashing Type	How It Appears	Red Flags to Watch
Name washing	Rebranding an existing fund as "ESG" or "sustainable"	Similar holdings to the old fund; no methodology change
Data manipulation	Selecting the ESG data provider whose ratings happen to favor the portfolio	Undisclosed rating provider; no third-party verification
Scope 3 omission	Reporting only direct emissions (Scope 1+2), not supply chain emissions	"Net zero" claims that exclude the largest emission sources
Best-in-class washing	"Best ESG oil company" still produces oil	Sector exclusion vs relative ranking confusion

• In 2023, the SEC charged multiple asset managers with ESG misrepresentation, including Goldman Sachs Asset Management ($4M settlement) and Deutsche Bank's DWS division ($25M settlement) for overstating ESG integration in their investment processes.
• The EU's Sustainable Finance Disclosure Regulation (SFDR) introduced Article 8 and Article 9 fund classifications, attempting to standardize ESG claims — though critics argue the categories are still too broad to prevent greenwashing.
• A more direct approach to impact: direct donations to effective nonprofits, voting your proxies, or divestment from specific industries in your personal taxable account may accomplish more real-world good than buying an ESG-labeled fund whose holdings still include the same companies.

Tip: Use the Morningstar Sustainability Rating and MSCI ESG Fund Rating to get an independent view of any ESG fund's actual holdings-level ESG exposure. Do not rely solely on the fund's own marketing materials or its name.