What Is ESG? Environmental, Social and Governance Explained

ESG (Environmental, Social, and Governance) is a framework used to evaluate a company’s sustainability and ethical impact. Instead of only looking at financial profit, ESG investing analyzes how a business impacts the planet, treats its people, and manages its operations.

• Environmental: How a company impacts nature (e.g., carbon emissions, waste management, energy use).
• Social: How a company treats people (e.g., employee safety, diversity, human rights, customer data protection).
• Governance: How a company is run (e.g., board diversity, executive pay, anti-corruption policies).

Last reviewed: July 14, 2026.

Investment risk disclosure: This article provides general educational information, not individualized financial advice. ESG labels and ratings do not eliminate market risk, guarantee positive impact, or ensure that an investment will outperform.

Key takeaways

• Environmental factors include climate exposure, emissions, energy, pollution, water, waste, biodiversity, and resource use.
• Social factors include labor practices, worker safety, human rights, product safety, data privacy, customers, suppliers, and communities.
• Governance factors include board oversight, business ethics, accounting controls, executive pay, shareholder rights, corruption prevention, and risk management.
• ESG integration means considering material ESG information in investment analysis. It does not automatically require excluding any particular industry.
• There is no universal ESG score. Providers use different issues, data, weights, scales, peer groups, and controversy adjustments.
• A high ESG rating does not necessarily mean that a company is ethical, low-impact, or suitable for every investor.
• ESG-related strategies can outperform or underperform. Portfolio construction, fees, sector exposure, geography, valuation, and the time period still matter.

What does ESG stand for?

ESG stands for Environmental, Social, and Governance. These are broad groups of information that can help investors evaluate how a company is exposed to sustainability-related risks and opportunities, how it affects people and the environment, and how effectively it is directed and controlled.

ESG pillar	Issues it may include	Questions an investor might ask
Environmental	Greenhouse gas emissions, climate risk, energy use, pollution, waste, water, biodiversity, land use, materials, and supply-chain impacts	Which environmental issues are financially or operationally material? Are targets supported by a baseline, capital plan, timeline, and verified data?
Social	Worker health and safety, wages, labor rights, human rights, diversity, product safety, customer welfare, data privacy, suppliers, and communities	Where are the company’s most serious workforce, product, customer, and supply-chain risks? How are incidents measured and remediated?
Governance	Board oversight, independence, accounting, audit controls, ethics, corruption, tax conduct, executive compensation, shareholder rights, cybersecurity oversight, and risk management	Is the board capable and accountable? Are incentives aligned with long-term performance? Are reporting and internal controls reliable?

The governance pillar overlaps with traditional corporate governance, but ESG analysis usually connects governance with environmental and social oversight as well.

How ESG works in investing

CFA Institute describes ESG investing as the consideration of environmental, social, and governance factors in investment decisions. In practice, an investor may use ESG information to identify risks, test assumptions, compare companies, adjust forecasts, select or exclude securities, engage with management, or monitor a portfolio.

A basic ESG analysis usually follows these steps:

1. Define the objective. Decide whether the purpose is financial-risk analysis, values alignment, sustainability outcomes, regulatory compliance, or a combination.
2. Identify material issues. Determine which environmental, social, and governance topics are most relevant to the company’s industry, assets, markets, and value chain.
3. Gather evidence. Review regulatory filings, financial statements, sustainability reports, policies, controversies, operational data, targets, assurance statements, and independent sources.
4. Assess exposure and management. Separate the severity of a risk from the quality of the company’s response.
5. Connect ESG information to financial analysis. Consider potential effects on revenue, costs, assets, liabilities, cash flow, financing, reputation, regulation, and competitive position.
6. Compare alternatives. Compare companies with relevant peers using consistent definitions and time periods.
7. Monitor change. Ratings, incidents, regulations, targets, management quality, and company exposure can change after the initial investment.

This process is often called ESG integration. Integration does not automatically mean choosing only companies with the highest third-party ratings. It means incorporating material information into the investment process rather than treating ESG as a separate marketing label.

Financial, impact and double materiality

Disagreements about ESG often begin with different definitions of materiality. Three lenses are commonly used:

Materiality lens	Primary question	Typical audience	Example
Financial materiality	How could a sustainability-related issue affect the company’s prospects, cash flows, access to finance, or cost of capital?	Investors, lenders and other capital providers	How water scarcity could limit production or increase operating costs
Impact materiality	How does the organization significantly affect the economy, environment, people, or human rights?	Employees, communities, regulators, civil society, customers and investors	How a company’s discharge affects a local watershed and neighboring communities
Double materiality	What are the material financial effects on the company and the material impacts caused by or connected to it?	Multiple stakeholder groups	Both the financial cost of water scarcity and the company’s effect on local water availability

IFRS S1 is focused on sustainability-related risks and opportunities that could affect a company’s prospects. The GRI Standards focus on an organization’s significant impacts on the economy, environment, and people, including human rights.

Examples of ESG in practice

A credible ESG assessment looks beyond policies and slogans. It asks whether the company has identified a material issue, measured its starting position, assigned responsibility, committed resources, reported progress, and addressed failures.

Pillar	Stronger evidence	Warning signs	What to verify
Environmental	Complete emissions inventory, material reduction plan, capital allocation, energy and water data, independent assurance, and reporting across relevant operations and supply chains	Targets without a baseline, selective reporting, distant commitments without interim milestones, or reliance on offsets without reducing core emissions	Scope, methodology, target coverage, capital spending, progress, assurance and material environmental incidents
Social	Safety data, fair-labor controls, supplier due diligence, product-quality systems, grievance mechanisms, remediation records, retention data and clear accountability	Policies without outcome data, repeated safety incidents, high turnover, unresolved labor disputes, supply-chain abuses, or weak customer and privacy controls	Incident rates, affected populations, remediation, supplier coverage, product recalls, employee turnover and independent findings
Governance	Capable and independent oversight, reliable audits, protected whistleblowing, transparent incentives, ethics controls, clear risk ownership and meaningful shareholder rights	Related-party conflicts, accounting restatements, excessive incentive risk, board entrenchment, retaliation, opaque ownership, or recurring legal and compliance failures	Board composition, expertise, tenure, incentive design, audit quality, voting rights, investigations and controversy response

Materiality changes by industry. Direct office emissions may be a minor issue for a bank compared with financed emissions, fair lending, data security and conduct. For a mining company, tailings safety, water, worker health, land rights and community relationships may be central. For a software company, privacy, cybersecurity, workforce management and responsible technology governance may be more material than direct emissions.

Useful ESG key performance indicators should therefore reflect the company’s actual business model rather than a generic checklist applied equally to every industry.

What makes an ESG claim credible?

• A defined issue and reporting boundary
• A measurable baseline
• Near-term and long-term targets
• Named management and board accountability
• A funded implementation plan
• Consistent year-over-year data
• Transparent setbacks and corrective action
• Independent assurance where appropriate

How investors use ESG

ESG is used through several investment approaches. CFA Institute, the Global Sustainable Investment Alliance, and the Principles for Responsible Investment have published harmonized definitions to reduce confusion.

Approach	How it works	What it does not automatically mean
Screening	Applies rules to include or exclude investments based on defined characteristics, sectors, conduct, norms, or thresholds	That every remaining company has a positive impact
ESG integration	Explicitly includes material ESG information in investment analysis and decisions	That particular sectors must be excluded
Thematic investing	Invests around trends such as clean energy, water, circular materials, health, or climate adaptation	That every holding has strong governance or low valuation risk
Stewardship	Uses voting, engagement, escalation and other investor rights to influence or oversee investee companies	That engagement will always produce the intended change
Impact investing	Intends to generate a measurable social or environmental contribution alongside a financial return	That an ESG rating alone proves intentional or additional impact

These approaches sit within the broader field of sustainable investing. Impact investing is more specific because it adds an explicit impact intention and a need to measure outcomes.

Does ESG investing improve returns?

ESG does not guarantee higher returns or lower risk. Material environmental, social, and governance issues can affect a company’s costs, revenue, liabilities, reputation, financing, and competitive position. That makes them relevant to financial analysis, but relevance is not the same as automatic outperformance.

A NYU Stern and Rockefeller Asset Management research review examined more than 1,000 studies published between 2015 and 2020. It found substantial evidence of positive relationships in corporate-focused research, particularly when businesses concentrated on material sustainability issues. Investor-level outcomes were more mixed.

Shorter-term fund results also change. Morgan Stanley reported that sustainable funds returned a median 0.4% in the second half of 2024, compared with 1.7% for traditional funds. In the first half of 2025, sustainable funds outperformed, with regional and currency exposure contributing materially to the result. These reversals show why a label alone cannot explain performance.

Returns may be affected by:

• Sector and industry exposure
• Growth, value, quality and size factors
• Regional and currency allocation
• Security selection and valuation
• Fund fees and turnover
• Exclusions that remove strong or weak performers
• The quality and materiality of the ESG process
• The measurement period

The defensible conclusion is not that ESG always outperforms. It is that financially material ESG information can improve the completeness of investment analysis when it is used rigorously.

What is an ESG score?

An ESG score or rating is a provider’s assessment based on its own methodology, data, issue selection, weighting, peer group, controversy treatment, and rating scale. It is not an official universal grade.

Who calculates ESG scores?

Specialized research firms and financial-data providers calculate ESG ratings. Three widely used providers illustrate why scores must be interpreted rather than simply compared:

Provider	What it primarily measures	Scale and interpretation	Important limitation
MSCI ESG Ratings	How resilient a company is to financially relevant, industry-specific sustainability risks and opportunities	AAA to CCC; industry-relative, with companies assessed against relevant peers	A strong rating is not proof that a company has low absolute impact or meets an investor’s ethical criteria
Morningstar Sustainalytics ESG Risk Ratings	The amount of financially material ESG risk left unmanaged after considering exposure and management	Negligible, low, medium, high, or severe; lower numeric risk is better	The direction and scale differ from providers where a higher score is better
S&P Global ESG Scores	Performance and management of material ESG risks, opportunities, and impacts through the Corporate Sustainability Assessment	CSA-based scores supported by company information, external data, media analysis, modeling and engagement	Assessment scope, participation, modeled data and industry methodology must be reviewed before comparison

For a deeper provider comparison, see the guide to ESG rating agencies.

Why do ESG ratings disagree?

The MIT Aggregate Confusion Project found that ratings from prominent ESG agencies had an average correlation of 0.54. Major credit ratings had a correlation of 0.92 in the comparison.

ESG ratings may diverge because providers make different choices about:

• Scope: which environmental, social and governance issues are included
• Measurement: which indicators and data sources represent each issue
• Weights: how much each issue contributes to the final score
• Materiality: whether the rating emphasizes financial risk, company impact, or both
• Peer groups: whether a company is compared with its industry or the whole market
• Controversies: how incidents are identified, scored, dated and resolved
• Missing data: how estimates and modeled values are used

In the European Union, Regulation (EU) 2024/3005 began applying on July 2, 2026. It introduces transparency and integrity requirements for ESG rating activities, but it does not create one mandatory universal ESG score.

How to read an ESG score

1. Identify the provider and read its methodology.
2. Determine whether a higher or lower score is better.
3. Check whether the score is industry-relative or absolute.
4. Review the issue-level scores rather than relying only on the headline rating.
5. Check the rating date, controversy date and whether the company has responded.
6. Compare the score with company filings and independent evidence.
7. Confirm that the methodology matches your financial and values-based objectives.

Advanced investors may also develop a framework to calculate an individual ESG score, but the same methodological choices and data limitations still apply.

ESG reporting standards versus ESG ratings

Reporting standards tell companies what information to disclose or how to organize it. Rating providers analyze information and produce assessments. A standard is not itself a company rating.

System	Primary purpose	Materiality orientation	Typical output
ISSB / IFRS S1 and S2	Investor-focused sustainability-related financial disclosure	Risks and opportunities that could affect company prospects, cash flows, access to finance, or cost of capital	Company disclosures for general-purpose financial reporting
SASB Standards	Industry-specific disclosure topics and metrics useful to investors	Financially relevant sustainability risks and opportunities across 77 industries	Comparable industry-based disclosures
GRI Standards	Reporting an organization’s significant impacts on the economy, environment, people, and human rights	Impact materiality	Stakeholder-oriented sustainability disclosures
ESG rating providers	Assess companies, issuers, securities, or funds using proprietary methodologies	Varies by provider	Scores, risk categories, letter ratings, issue assessments, and controversy research

The SASB Standards are especially useful for understanding why a material issue for one industry may be less significant for another.

ESG vs. CSR: What is the difference?

Corporate social responsibility, or CSR, describes how a company understands and manages its responsibilities and impacts on society. ESG organizes environmental, social, and governance information for measurement, management, disclosure, and analysis.

Dimension	ESG	CSR
Primary focus	Environmental, social and governance risks, opportunities, impacts, controls and performance	How a business accepts and manages responsibility for its effects on society
Common users	Investors, lenders, companies, regulators, rating providers and other stakeholders	Companies, employees, customers, communities and other stakeholders
Typical tools	Metrics, disclosures, materiality analysis, ratings, screening, integration and stewardship	Policies, programs, codes of conduct, community initiatives and responsibility strategies
Financial connection	Often explicitly connected to investment risk, opportunity and company prospects	May support reputation, stakeholder relationships and long-term business responsibility but is not inherently an investment methodology
Main limitation	Scores and definitions vary and can be misunderstood	Programs can become disconnected from the company’s most material impacts or core business model

The European Commission describes CSR in terms of enterprise responsibility for impacts on society. ESG analysis may use evidence from a company’s CSR activities, but a charitable program alone does not demonstrate strong ESG performance.

ESG vs. SRI vs. impact investing

ESG, socially responsible investing, and impact investing are related but distinct approaches.

Approach	Main objective	Common method	Key question
ESG integration	Improve investment analysis by considering material environmental, social and governance information	Adjust research, forecasts, valuations, risk assessments or portfolio decisions	Could this issue affect risk, opportunity or company value?
Socially responsible investing	Align a portfolio with defined ethical, religious, social or environmental values	Negative and positive screening	Does this investment comply with the investor’s values or exclusions?
Impact investing	Generate an intentional and measurable social or environmental contribution alongside a financial return	Invest in activities or organizations tied to defined outcomes and measure results	What outcome is intended, how will it occur, and how will it be measured?

See the detailed comparison of ESG vs. SRI vs. impact investing or review the benefits and limitations of socially responsible investing.

The history of ESG

Ethical and responsible investment practices predate the ESG acronym. The modern ESG framework developed as institutional investors and policymakers began treating environmental, social, and governance issues as potential financial risks and opportunities rather than only moral considerations.

Year	Development	Why it matters
2004	The UN-linked Who Cares Wins report called for environmental, social, and governance factors to be incorporated into investment research and financial markets.	The report helped bring the ESG acronym and integration concept into mainstream finance.
2005	The Freshfields report examined whether institutional investors could integrate ESG considerations within their fiduciary duties.	It helped establish the legal and fiduciary basis for considering financially material ESG information.
2006	The Principles for Responsible Investment launched at the New York Stock Exchange.	The six principles created an international investor network for incorporating ESG issues into investment and ownership practices.
2023	The ISSB issued IFRS S1 and IFRS S2, while CFA Institute, GSIA, and PRI published harmonized definitions for major responsible-investment approaches.	These developments improved consistency in investor-focused disclosure and terminology.
2024–2026	The EU adopted Regulation (EU) 2024/3005 for ESG rating activities, with application beginning July 2, 2026.	The regulation introduces oversight, transparency, methodology and conflict-management requirements for covered rating providers.

Market-size statistics require care. The Global Sustainable Investment Review 2024, published in 2025, identified $16.7 trillion in fund assets reporting the use of responsible or sustainable investment approaches under its current Morningstar-based analysis. The report warns that this narrower methodology is not directly comparable with earlier GSIA totals, so historical figures should not be placed in one growth table as though they measure the same universe.

Criticisms and limitations of ESG

ESG can provide useful information, but the term is broad and frequently misunderstood. Its main limitations include:

• No universal taxonomy: Organizations may use ESG to describe risk analysis, values alignment, sustainability performance, impact, disclosure, or several of these at once.
• Ratings divergence: Providers may reach different conclusions because they use different scopes, measurements, weights and peer groups.
• Data gaps: Company disclosures may be incomplete, inconsistent, unaudited, estimated, or limited to favorable indicators.
• Risk-impact confusion: A rating focused on financial risk to the company may not measure the company’s full impact on people or the environment.
• Industry-relative results: A company may rate well against peers in a high-impact industry without meeting an investor’s absolute sustainability threshold.
• Greenwashing: Marketing language, distant targets and selective disclosures may make a strategy look more substantive than it is.
• Backward-looking data: Ratings may lag operational changes, controversies, acquisitions or new regulation.
• Portfolio-label ambiguity: Two funds using “ESG” in their descriptions may have materially different holdings, exclusions and objectives.
• No return guarantee: ESG analysis does not remove valuation, economic, market, management, liquidity or concentration risks.

These limitations are reasons to improve methodology and due diligence—not reasons to ignore material environmental, social, or governance information.

How to evaluate an ESG investment

1. Define your objective. Decide whether you primarily want financial-risk integration, values alignment, thematic exposure, measurable impact, or active ownership.
2. Read the investment mandate. Identify exclusions, inclusion thresholds, rating providers, engagement policies, benchmark rules and impact commitments.
3. Inspect the methodology. Determine which issues are measured, how they are weighted, how missing data is treated, and whether the approach is industry-relative.
4. Examine the holdings. Review the largest positions, sector concentration, fossil-fuel exposure, controversial businesses and overlap with conventional products.
5. Verify material evidence. Check company filings, targets, performance data, controversies, board oversight and third-party assurance.
6. Compare conventional investment factors. Review valuation, fees, diversification, liquidity, tracking error, tax treatment, performance and risk.
7. Monitor the investment. A fund methodology, company rating, controversy, regulation or portfolio can change after purchase.

ESG stock screeners can help organize data and compare companies, but they should be a starting point rather than a substitute for primary research.

The bottom line

ESG is a framework for examining environmental, social, and governance information. Its strongest use is not as a moral seal or a prediction of superior returns, but as a structured way to identify material risks, opportunities, impacts, controls, and management quality that may be missed by a narrow reading of financial statements.

Use ESG scores carefully. Read the provider’s methodology, inspect the underlying issues, distinguish financial risk from real-world impact, and evaluate the investment’s fees, valuation, diversification, and portfolio fit. A clear objective and consistent evidence matter more than the ESG label itself.

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