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The Three Letters

ESG Glossary Primer: Key Terms Every Investor Should Know

Pomegra Learn

What Are the Most Important ESG Terms Every Investor Should Know?

ESG investing has generated its own vocabulary — a dense collection of acronyms, frameworks, regulatory titles, and technical terms that can make entry into the field feel like learning a new language. This primer organizes the most important ESG terms by category, providing concise working definitions and context for how each concept fits into the broader ESG landscape. It is not exhaustive — the full glossary at the end of this book covers over 100 terms — but it covers the vocabulary that recurs throughout ESG analysis, reporting, product selection, and governance discussions.

Quick definition: This ESG glossary primer organizes the most commonly used ESG investing terms into thematic categories: strategy types, data and ratings, regulatory frameworks, climate concepts, governance terms, and sustainability reporting standards. Each term is defined concisely with brief context for its practical relevance.

Key takeaways​

  • ESG terminology reflects three distinct intellectual traditions: investment management (risk-return frameworks), corporate disclosure (accounting and legal frameworks), and advocacy (social and environmental movements). Terms from different traditions sometimes use the same words to mean different things.
  • The acronym density of ESG — SFDR, CSRD, TCFD, ISSB, SASB, GRI, UN PRI, NZAMI, CA100+, SBTi — reflects the proliferation of regulatory, voluntary, and collaborative frameworks that have emerged since 2015.
  • Understanding which framework governs which activity is the critical skill: SFDR governs fund disclosure to EU investors; CSRD governs corporate sustainability reporting in the EU; ISSB sets investor-focused global standards; GRI sets impact-focused global standards.
  • Many ESG terms have contested definitions — "impact investing," "greenwashing," "materiality," and "ESG integration" are all used differently by different practitioners.
  • The most practically useful ESG vocabulary connects concepts to actions: knowing what SFDR Article 8 requires helps investors evaluate fund labels; knowing what scope 3 emissions are helps investors evaluate corporate climate commitments.

Strategy Terms​

Negative screening (exclusionary screening): Removing specific companies, sectors, or asset classes from an investment universe based on values-based criteria (tobacco, weapons) or conduct-based criteria (norms violations). The oldest ESG strategy, originating in religiously motivated investing.

Positive screening (best-in-class): Selecting the highest-ESG-quality companies within each sector rather than excluding entire sectors. Maintains sector diversification while creating an ESG quality tilt.

ESG integration: Incorporating ESG factors into fundamental investment analysis — affecting valuation, risk assessment, and portfolio construction — as financially relevant information, without necessarily excluding any securities.

Thematic investing: Concentrating a portfolio in companies aligned with specific sustainability themes — clean energy, water technology, gender lens, circular economy. Higher concentration and tracking error than broad ESG approaches.

Impact investing: Investing with the intention of generating measurable positive social or environmental outcomes alongside financial returns. Requires additionality evidence and outcome measurement.

Active ownership (stewardship): Using investor rights — proxy voting, shareholder resolutions, management engagement — to influence corporate ESG behavior. The engagement alternative to divestment.

Norms-based screening: Excluding companies in serious violation of international conduct standards — UN Global Compact, OECD Guidelines, ILO conventions — regardless of sector.

ESG momentum (ESG improvers): Selecting companies whose ESG scores are improving rather than those already at the top. Hypothesizes that ESG improvement creates financial value as market repricing occurs.

Data and Ratings Terms​

ESG rating: A score or grade assigned to a company reflecting its performance on environmental, social, and governance factors. Major providers include MSCI, Sustainalytics, S&P Global ESG, Bloomberg, and Moody's.

ESG divergence: The well-documented phenomenon that different ESG rating providers assign substantially different ratings to the same company, with inter-provider correlation typically below 0.60.

Materiality map: A framework (pioneered by SASB) identifying which ESG factors are financially material for companies in specific industries. Used to focus ESG analysis on the factors most relevant to each sector.

SASB (Sustainability Accounting Standards Board): Now operating within the IFRS Foundation's Value Reporting Foundation, SASB developed industry-specific materiality standards covering 77 industries. The standards identify financially material ESG disclosure topics for each industry.

GRI (Global Reporting Initiative): The world's most widely used sustainability reporting framework, with standards covering economic, environmental, and social topics. GRI is based on impact materiality — reporting on company effects on the world, not only on investors' financial assessment.

Scope 1, 2, and 3 emissions: The GHG Protocol's categorization of greenhouse gas emissions. Scope 1 = direct emissions from owned or controlled sources. Scope 2 = indirect emissions from purchased energy. Scope 3 = all other indirect emissions in the value chain.

Carbon footprint: The total greenhouse gas emissions (typically in CO₂ equivalents) attributable to an investment portfolio, company, or activity. Portfolio carbon footprints are typically measured as weighted average carbon intensity or total portfolio emissions.

Controversy flag: An ESG data provider's indication that a company has experienced a significant adverse event — environmental spill, labor violation, governance failure — that may affect ESG assessment. Controversy flags trigger engagement or exclusion review.

Regulatory Framework Terms​

SFDR (Sustainable Finance Disclosure Regulation): EU regulation requiring investment managers marketing to EU investors to disclose how they integrate sustainability risks and, for products with sustainability claims, to classify them as Article 8 (promote ESG characteristics) or Article 9 (sustainable investment objective).

CSRD (Corporate Sustainability Reporting Directive): EU directive requiring large and listed companies to report on sustainability information using European Sustainability Reporting Standards (ESRS). Covers double materiality — both financial and impact dimensions.

ISSB (International Sustainability Standards Board): The IFRS Foundation board that developed the IFRS S1 (general sustainability disclosure) and S2 (climate disclosure) standards, based on financial materiality for investor decision-making. Endorsed by IOSCO and securities regulators in many jurisdictions.

TCFD (Task Force on Climate-related Financial Disclosures): Industry-led framework (created 2017, concluded 2023 as ISSB incorporated its recommendations) for corporate climate risk disclosure across four pillars: governance, strategy, risk management, and metrics and targets.

EU Taxonomy: The EU's classification system defining which economic activities qualify as environmentally sustainable for regulatory purposes. Companies and funds must disclose their alignment with Taxonomy criteria.

ERISA (Employee Retirement Income Security Act): US federal law governing private-sector pension plans. The DOL's guidance under ERISA determines what ESG considerations are permissible in retirement plan investment decisions.

ESG framework navigator​

Climate Investing Terms​

Paris Agreement: The 2015 international climate treaty committing signatories to limit global warming to well below 2°C above pre-industrial levels, with efforts toward 1.5°C. The Paris Agreement is the primary reference point for corporate net-zero and portfolio alignment strategies.

Net zero: A state in which an entity's greenhouse gas emissions are balanced by equivalent removals or offsets. Net-zero commitments by companies and investors typically target 2050 with interim milestones.

Science-Based Targets initiative (SBTi): The independent organization that verifies corporate emissions reduction targets as consistent with limiting warming to 1.5°C or 2°C. SBTi-validated targets are considered the gold standard for corporate climate commitments. See sciencebasedtargets.org.

Stranded assets: Fossil fuel reserves and fossil-fuel-related assets that may not be fully utilized — and therefore lose financial value — as climate policy tightens and low-carbon energy becomes economically dominant.

Physical risk: Financial risk arising from the direct physical effects of climate change — hurricanes, floods, droughts, sea level rise — on assets, supply chains, and business operations.

Transition risk: Financial risk arising from the policy, technological, and market changes involved in transitioning to a lower-carbon economy — carbon pricing, stranded fossil fuel assets, changing consumer preferences.

Green bond: A bond whose proceeds are designated for environmentally beneficial projects. Governed by ICMA's Green Bond Principles and, in Europe, the EU Green Bond Standard.

Greenium: The yield differential (typically 2–10 basis points) between a green bond and a comparable conventional bond from the same issuer — reflecting investor willingness to accept slightly lower yield for a sustainability-labeled instrument.

NZAMI (Net Zero Asset Managers Initiative): A coalition of investment managers committing to supporting the goal of net-zero greenhouse gas emissions by 2050, implementing net-zero investment strategies, and reporting on progress.

Governance Terms​

Say-on-pay: The shareholder vote on executive compensation packages, typically advisory (non-binding) in the US and binding in some European jurisdictions. A key active ownership tool for addressing excessive executive pay.

Proxy voting: The process by which shareholders vote on agenda items at annual meetings — director elections, say-on-pay, auditor ratification, shareholder resolutions — without attending in person. Institutional investors cast billions of proxy votes annually.

Shareholder resolution: A proposal submitted by shareholders for inclusion in the annual meeting agenda. ESG resolutions typically request specific disclosures, ask companies to adopt policies, or propose governance changes.

Board independence: The proportion of board directors who are not current or recent executives of the company. Higher independence is generally associated with better governance quality and stronger shareholder accountability.

Executive compensation alignment: The degree to which executive pay is linked to long-term financial and ESG performance rather than short-term targets. ESG investors increasingly engage to include sustainability metrics in executive pay.

Sustainability Reporting Standards​

Double materiality: The CSRD's requirement that companies assess sustainability topics from both financial materiality (ESG effects on the company) and impact materiality (the company's effects on the world) perspectives.

ESRS (European Sustainability Reporting Standards): The detailed standards developed by EFRAG under the CSRD mandate, covering environmental, social, and governance disclosure requirements including double materiality assessment.

TNFD (Taskforce on Nature-related Financial Disclosures): The voluntary framework for assessing and disclosing nature-related risks and opportunities, developed as a nature-focused parallel to the TCFD. Finalized in 2023.

WACI (Weighted Average Carbon Intensity): A portfolio-level climate metric measuring the weighted average of portfolio companies' carbon intensity (emissions per unit of revenue). Widely used in portfolio climate risk assessment.

Additionality: In impact investing, the principle that an investment creates outcomes that would not have occurred without it. The most demanding standard for measuring genuine impact, distinguishing it from investing in already-successful impact companies.

Common mistakes​

Conflating ESG and SRI: Socially responsible investing (SRI) historically relied on values-based exclusions; ESG is a broader analytical framework that can be applied from a purely financial-risk perspective without any values-based exclusion. The terms are not synonymous, though they overlap significantly.

Using "sustainable" and "ESG" interchangeably: In regulatory contexts (particularly the SFDR), "sustainable investment" has a specific legal definition (Article 9 funds). Using "sustainable" loosely may create legal exposure in European fund marketing.

Assuming TCFD and ISSB are the same thing: TCFD developed the climate disclosure framework; ISSB incorporated and built on TCFD recommendations in developing IFRS S2. TCFD the task force concluded its work in 2023, having achieved the goal of embedding its framework in ISSB standards. Current corporate reporting requirements reference ISSB/IFRS S2, not the original TCFD framework as a separate standard.

FAQ​

What is the difference between ESG and CSR?​

Corporate Social Responsibility (CSR) is a company-side concept — how a company manages its social and environmental impacts, typically expressed through philanthropic programs, sustainability reports, and community engagement. ESG is an investor-side concept — how investors analyze environmental, social, and governance factors to assess financial risk and return. CSR is what companies do; ESG is what investors analyze. In practice the two overlap significantly, since ESG analysis often draws on CSR disclosures.

What does "Article 8" vs "Article 9" mean for funds?​

Under the EU's SFDR, Article 8 funds "promote" environmental or social characteristics but do not have sustainable investment as their primary objective. Article 9 funds have sustainable investment as their explicit objective and must measure and report the sustainability of all their investments. Article 9 is a stricter classification with more demanding disclosure requirements.

What is the difference between ISSB and SASB?​

SASB developed industry-specific standards identifying financially material ESG disclosure topics for 77 industries. ISSB is the IFRS Foundation board that develops global sustainability reporting standards (S1 and S2) for investor decision-making. In 2022, the SASB Standards were consolidated into the IFRS Foundation's framework, and ISSB now maintains them. SASB standards are an input to ISSB's framework — investors and companies can use SASB's industry-specific guidance as a reference for what to disclose under ISSB's general requirements.

What is a B Corporation?​

A B Corporation (B Corp) is a company certified by B Lab as meeting standards for social and environmental performance, accountability, and transparency. B Corp certification is independent of legal form; companies seeking formal legal mission-protection use Benefit Corporation (B Corp legal structure), available in many US states. Certification requires reassessment every three years and covers performance across workers, community, environment, customers, and governance.

Where can I find authoritative ESG regulatory information?​

For US securities regulation: sec.gov. For US retirement plan rules: dol.gov. For EU sustainable finance regulation: esma.europa.eu and the European Commission's sustainable finance portal. For ISSB standards: ifrs.org. For UN PRI information: unpri.org. For TCFD/ISSB climate disclosure: tcfdhub.org. Rules in this area evolve rapidly; always verify current requirements with the relevant authority.

Summary​

ESG investing's vocabulary reflects its origins at the intersection of investment management, corporate disclosure, and social advocacy. Mastering the key terms — strategy types (screening, integration, thematic, impact, engagement), data and ratings concepts (ESG divergence, materiality maps, carbon accounting), regulatory frameworks (SFDR, CSRD, ISSB), and climate-specific vocabulary (net zero, stranded assets, greenium) — provides the analytical foundation for evaluating ESG claims, selecting products, and engaging with corporate disclosure. Where terms are contested or have multiple meanings across different frameworks, context matters: knowing which framework a term comes from determines which definition applies. The full glossary at the end of this book provides comprehensive coverage; this primer covers the vocabulary that will recur throughout every subsequent chapter.

Chapter 2 Complete​

This concludes Chapter 2: The Three Letters. You have covered the full landscape of ESG investing — from the definition of the three letters through strategy types, asset classes, governance frameworks, and the philosophical debates about fiduciary duty and stakeholder capitalism that give ESG its contested character. Chapter 3 turns to the engines of ESG analysis: the ratings and data providers, and the significant disagreements that arise when different providers rate the same company very differently.

→ Chapter 3: ESG Ratings and Their Disagreements