The Complete A to Z Dictionary of ESG Terms and Sustainability Definitions

New regulations, carbon accounting standards, and sustainability frameworks often bring complex terms, acronyms, and technical definitions. If you’re reading a sustainability report, getting ready for compliance, or working with emissions data, the number of terms in environmental, social, and governance topics can feel overwhelming. That’s why we created this ESG Glossary to help make things simpler. This practical A to Z guide explains ESG terms clearly and simply, without extra jargon.

Assurance

Independent verification of ESG data to confirm accuracy, completeness, and reliability. It increases trust in sustainability reporting for regulators, investors, and other stakeholders. Assurance can be limited or reasonable, depending on the level of scrutiny applied. It is increasingly required under regulatory frameworks such as CSRD.

Auditor

An auditor is an independent professional who reviews and verifies a company’s financial or sustainability information to ensure it is accurate, complete, and compliant with relevant laws, standards, or regulations.

In ESG and carbon accounting, an auditor checks emissions data, reporting processes, and documentation to confirm that the information can be trusted by regulators, investors, and other stakeholders.

Audit Readiness

The ability to demonstrate that ESG data is documented, traceable, and verifiable. Audit-ready data supports external assurance and regulatory compliance. This includes clear methodologies, data sources, and internal controls. Audit readiness reduces risk during reviews and audits.

Baseline Year

A reference year used to measure progress against sustainability targets. It provides a consistent starting point for tracking improvements over time. Baseline years are commonly used in carbon reduction targets. Changes to the baseline year must be clearly documented.

Biodiversity

The variety of ecosystems, species, and genetic diversity in nature. Biodiversity loss can create environmental, operational, and financial risks for companies. Impacts may occur through land use, pollution, or resource extraction. Biodiversity is increasingly addressed in ESG reporting and regulation.

Carbon Accounting

The process of measuring and managing greenhouse gas emissions from business activities. It is used to calculate Scope 1, 2, and 3 emissions and track reductions. Carbon accounting relies on activity data and emissions factors. It forms the basis for climate reporting and target-setting.

Carbon Capture and Storage (CCS)

Carbon capture and storage (CCS) refers to the capture of carbon dioxide emissions from industrial sources followed by permanent storage underground. The captured CO₂ is typically stored in geological formations such as depleted oil and gas reservoirs. CCS recognizes emissions that are captured before entering the atmosphere. It is mainly used in hard-to-abate sectors with limited decarbonization alternatives. CCS can reduce gross emissions but does not eliminate the need for emission reductions. Long-term monitoring and governance are critical to ensure storage permanence.

Carbon Capture and Utilization (CCU)

Carbon capture and utilization (CCU) involves capturing carbon dioxide and using it as an input to products or processes. Examples include fuels, building materials, or chemicals. Unlike storage, utilization does not always result in permanent removal of carbon from the atmosphere. The climate benefit of CCU depends on the product's lifetime and whether emissions are delayed or avoided. CCU may contribute to circular carbon solutions in certain contexts. Its impact must be assessed carefully to avoid double counting.

Carbon Removal

Carbon removal refers to activities that remove carbon dioxide from the atmosphere and store it durably. This includes nature-based solutions and technological approaches such as DAC with storage. Carbon removal is distinct from emission reductions and offsets. It is primarily used to neutralize residual emissions in net-zero strategies. The effectiveness of carbon removal depends on permanence, additionality, and measurement accuracy. Robust governance is essential to ensure credibility.

Carbon Offsetting

Carbon offsetting involves compensating for emissions by financing emission reduction or avoidance projects elsewhere. Offsets do not necessarily remove CO₂ from the atmosphere. They are often used to balance emissions in the short term. Offsetting is increasingly restricted in net-zero frameworks. It should not replace emission reductions. Transparency is critical.

Carbon Footprint

The total greenhouse gas emissions caused directly and indirectly by an organization, product, or activity. It is typically expressed in CO₂-equivalents. Carbon footprints can be calculated at the corporate, product, or project level. They are used to identify opportunities for reduction.

Carbon Neutral

A state where greenhouse gas emissions are balanced through reductions, removals or offsets. Carbon neutrality does not necessarily mean zero emissions. It often relies on offsetting remaining emissions. Many organizations use carbon neutrality as an interim climate goal.

California Climate Laws (SB 253 & SB 261)

SB 253 requires large companies doing business in California to disclose Scope 1, 2, and 3 emissions.

SB 261 requires disclosure of climate-related financial risks. These laws apply to many non-US companies with California activity. They are among the most far-reaching climate disclosure laws globally. They significantly increase Scope 3 reporting requirements.

CBAM

The Carbon Border Adjustment Mechanism (CBAM) is a European Union regulation that puts a carbon price on certain goods imported into the EU.In short, CBAM aims to prevent “carbon leakage” by ensuring that imported products such as cement, steel, aluminum, fertilizers, electricity, and hydrogen are subject to a carbon cost similar to that of goods produced within the EU under the EU Emissions Trading System (EU ETS).Importers must report the embedded greenhouse gas emissions in covered products and, over time, purchase CBAM certificates to reflect those emissions.

CDP

CDP is an international non-profit organization that runs a global environmental disclosure system for companies, cities, states, and regions.

CDP helps organizations measure and disclose their environmental impact so investors, customers, and stakeholders can assess climate and sustainability performance. CDP reporting is organized into three main categories:

- Climate Change: greenhouse gas emissions, climate risks, and transition plans
- Water Security: water use, risks, and management strategies
- Forests: deforestation risks linked to commodities such as timber, palm oil, soy, and cattle

Companies receive a score (from D to A) based on transparency, data quality, and environmental leadership.

Climate Risk

Potential negative impacts on a company due to climate change. These include physical risks and transition risks. Climate risks can affect operations, supply chains, and financial performance. They are a key focus of climate-related disclosures.

CSDDD (Corporate Sustainability Due Diligence Directive)

The CSDDD introduces mandatory sustainability due diligence for large companies. It requires companies to identify, prevent, mitigate, and address human rights and environmental impacts. CSDDD applies across the value chain. It strengthens accountability beyond reporting. The directive focuses on behavior and processes, not only disclosure.

CSRD

The CSRD is an EU regulation requiring companies to report standardized sustainability information. It significantly expands the scope, depth, and assurance of ESG reporting. CSRD applies to large companies and listed SMEs in the EU. Reports must follow ESRS standards.

Data Gap

Missing or incomplete ESG data required for reporting or analysis. Data gaps must be identified and addressed to ensure accurate disclosures. They often occur in the value chain or Scope 3 data. Managing data gaps is part of audit readiness.

Decarbonization

Decarbonization refers to reducing greenhouse gas emissions from activities, operations, and value chains. It focuses on avoiding and reducing emissions at the source. Examples include energy efficiency, renewable energy, process changes, and supplier engagement. Decarbonization is the primary lever in credible climate strategies. It must occur before relying on offsets or removals. Long-term climate targets depend on sustained decarbonization.

Carbon Capture and Utilization (CCU)

Double Materiality

An assessment of how sustainability issues affect a company financially and how the company impacts society and the environment. It is a core requirement under CSRD. Double materiality combines financial and impact materiality perspectives. The assessment informs reporting and strategy.

Emissions Factor

A coefficient used to convert activity data into greenhouse gas emissions. Emission factors are typically sourced from recognized databases. They vary by geography, fuel type, and year. Using appropriate factors improves accuracy.

ESG

ESG stands for Environmental, Social, and Governance, and refers to the three key areas used to evaluate a company’s sustainability performance and overall responsibility. Its a framework used to assess sustainability performance and non-financial risks. ESG factors influence long-term value creation and business resilience. Investors increasingly use ESG information in decision-making. ESG also supports regulatory compliance.

ESRS (European Sustainability Reporting Standards)

Mandatory standards defining what companies must disclose under CSRD. ESRS ensures consistency and comparability of sustainability reporting in the EU. They cover environmental, social, and governance topics. ESRS includes both qualitative and quantitative disclosures.

EU Emissions Trading System (EU ETS)

The EU Emissions Trading System is the EU’s cap-and-trade system for greenhouse gas emissions. It sets a cap on emissions and allows trading of emission allowances. The ETS primarily applies to energy-intensive sectors. It creates a carbon price signal. The system supports emission reductions cost-effectively.

EU Green Deal

EU Taxonomy Regulation

The EU Taxonomy establishes a classification system for environmentally sustainable economic activities. It defines criteria for activities that contribute substantially to environmental objectives while avoiding significant harm. Companies must disclose the share of turnover, CapEx, and OpEx aligned with the Taxonomy. The Taxonomy supports sustainable finance and investment decisions. It is closely linked to CSRD reporting.

Financial Materiality

The significance of sustainability issues on a company’s financial performance and position. It focuses on risks and opportunities for the business. Financial materiality is one part of double materiality. It aligns ESG topics with enterprise risk management.

Fossil Fuels

Fossil fuels are natural energy resources, such as coal, oil, and natural gas, that formed from ancient plants and animals over millions of years.When burned to produce energy, fossil fuels release carbon dioxide (CO₂) and other greenhouse gases, making them a major source of global carbon emissions and a driver of climate change.

GHG Protocol

The Greenhouse Gas Protocol (GHG Protocol) is the most widely accepted global standard for measuring and reporting greenhouse gas emissions. It defines how organizations calculate emissions across Scope 1 (direct), Scope 2 (purchased energy), and Scope 3 (value chain) to ensure consistent, transparent, and comparable climate reporting.

The GHG Protocol is the foundation for most climate-related reporting frameworks and regulations, including CSRD/ESRS, SBTi, CDP, and net-zero strategies, and is widely used for carbon accounting, target-setting, and assurance-ready reporting.

Governance

The structures, policies, and processes used to direct and control an organization. Strong governance supports accountability and risk management. Governance includes leadership roles and oversight. It is a key pillar of ESG.

GRI

The Global Reporting Initiative (GRI) is an international organization that develops widely used sustainability reporting standards.The GRI provides standards for reporting an organization’s impacts on the economy, environment, and people. GRI focuses on impact materiality rather than financial materiality. It is widely used for sustainability and impact reporting. GRI standards are voluntary but globally recognized. They are often used alongside regulatory reporting.

Human Rights

Fundamental rights related to dignity, equality, and fair treatment. Companies are expected to respect human rights across their operations and value chains. This includes labor rights and working conditions. Human rights due diligence is increasingly regulated.

ISO 14064

ISO 14064 is an international standard for quantifying and reporting greenhouse gas emissions. It complements the GHG Protocol with technical requirements. ISO 14064 is commonly used for verification and assurance. It supports consistency in carbon reporting. The standard is recognized globally.

Impact Materiality

The significance of a company’s impact on people and the environment. It focuses on external effects rather than financial consequences. Impact materiality considers severity and likelihood. It is assessed as part of double materiality.

Indirect Emissions

Greenhouse gas emissions not directly controlled by the company. These include Scope 2 and Scope 3 emissions. Indirect emissions often represent the largest share of total emissions. They require supplier and value chain data.

ISSB (International Sustainability Standards Board)

The ISSB develops global sustainability disclosure standards focused on enterprise value. Its standards are designed to create a global baseline for sustainability-related financial information. ISSB builds on TCFD and other frameworks. The standards are primarily aimed at capital markets. They support comparability across jurisdictions.

KPI (Key Performance Indicator)

A measurable metric used to track ESG performance and progress. KPIs support decision-making and transparency. They can be qualitative or quantitative. KPIs are commonly disclosed in sustainability reports.

Lifecycle Assessment (LCA)

An analysis of environmental impacts across a product’s entire lifecycle. It covers raw materials, production, use, and end-of-life. LCA helps identify hotspots and trade-offs. It is commonly used for product-level assessments.

Low-Carbon Transition

The shift from high-emission activities to low-carbon and climate-resilient alternatives. It involves reducing greenhouse gas emissions by changing energy systems, technologies, business models, and behavior. The low-carbon transition is driven by regulation, market expectations, and climate targets. It creates both risks and opportunities for companies.

Materiality Assessment

A structured process to identify and prioritize the most significant ESG topics. It informs strategy, reporting, and risk management. The process involves stakeholder input and data analysis. Results guide disclosure focus.

Mitigation

Actions taken to reduce or prevent negative environmental or social impacts. Mitigation measures are key to sustainability strategies. Examples include emission reductions and safety improvements. Mitigation is often tracked through KPIs.

Net Zero

A state where greenhouse gas emissions are reduced to near zero, with remaining emissions removed from the atmosphere. Net zero requires deep reductions, not only offsets. It typically covers Scope 1, 2, and 3 emissions. Net-zero targets are often long-term.

Mitigation

OECD Guidelines for Multinational Enterprises

The OECD Guidelines for Multinational Enterprises provide recommendations for responsible business conduct. They cover human rights, labor, environment, and anti-corruption. The guidelines are aligned with due diligence expectations. They are referenced in several ESG regulations. Companies use them to guide responsible operations.

Offsetting

Compensating for emissions by financing emission reduction or removal projects. Offsetting does not replace direct emission reductions. It is usually applied to residual emissions. Transparency around offsets is essential.

Operational Control

An approach for defining emissions boundaries based on operational authority. It determines which emissions are included in reporting. Operational control is commonly used in carbon accounting. The approach must be applied consistently.

Paris Agreement

The Paris Agreement is an international treaty aimed at limiting global warming to well below 2°C. It provides the global policy foundation for climate targets and regulations. Corporate climate strategies often reference its goals. The agreement influences national climate policies. It underpins many climate frameworks.

Physical Climate Risk

Risks resulting from physical impacts of climate change, such as floods or heatwaves. These risks can disrupt operations and supply chains. Physical risks may be acute or chronic. They are assessed in climate risk analyses.

Policies

Formal statements outlining a company’s commitments and principles on topics. Policies guide behavior and support compliance. They are often required by regulation. Policies should be reviewed regularly.

Reporting Boundary

The scope of entities and activities included in ESG reporting. Clear boundaries ensure completeness and consistency. Boundaries must be disclosed transparently. They align with organizational structures.

Risk Assessment

The process of identifying and evaluating ESG-related risks. It supports proactive risk management and resilience. Risk assessments consider likelihood and impact. Results inform mitigation actions.

SEC Climate Disclosure Rule

The SEC Climate Disclosure Rule requires certain US public companies to disclose climate-related risks and emissions information. The rule focuses on material climate risks to investors. Disclosure requirements are linked to financial materiality. The scope and implementation depend on company size and status. The rule aligns partially with TCFD concepts.

Science Based Targets initiative (SBTi)

The process of identifying and evaluating ESG-related risks. It supports proactive risk management and resilience. Risk assessments consider likelihood and impact. Results inform mitigation actions.

SFDR (Sustainable Finance Disclosure Regulation)

The SFDR requires financial market participants to disclose sustainability risks and impacts. It aims to increase transparency around sustainable investment products. SFDR classifies financial products under Articles 6, 8, and 9. It focuses on financial actors rather than corporations directly. Corporate ESG data is often used by investors to comply with SFDR.

Scope 1 Emissions

Direct greenhouse gas emissions from sources owned or controlled by the company. Examples include fuel combustion and company vehicles. Scope 1 emissions are directly influenced by operations. They are usually easier to measure.

Scope 2 Emissions

Indirect emissions from purchased electricity, heat, or cooling. They reflect energy consumption rather than generation. Scope 2 emissions can be reported using different methods. Energy sourcing strongly influences results.

Scope 3 Emissions

Scope 3 emissions are all other indirect emissions across the value chain. Scope 3 emissions often represent the largest share of total emissions. They include upstream and downstream activities.

Under the Greenhouse Gas Protocol, Scope 3 is divided into 15 categories:

1. Upstream (Supply Chain) Categories:
2. Purchased goods and services
3. Capital goods
4. Fuel- and energy-related activities (not included in Scope 1 or 2)
5. Upstream transportation and distribution
6. Waste generated in operations
7. Business travel
8. Employee commuting
9. Upstream leased assets

Downstream (Value Chain) Categories:
‍
9. Downstream transportation and distribution
10. Processing of sold products
11. Use of sold products
12. End-of-life treatment of sold products
13. Downstream leased assets
14. Franchises
15. Investments

For many companies, Scope 3 represents the largest share of total emissions and often the most complex to measure and manage.

Social Factors

ESG topics related to people, such as labor rights, diversity, and health and safety. They affect workforce stability and reputation. Social factors also include community impacts. They are increasingly regulated.

Sustainability Strategy

A sustainability strategy is a long-term plan that integrates environmental, social, and governance (ESG) considerations into a company’s overall business objectives.

In short, it aligns sustainability with value creation by setting clear priorities, targets, and actions. It guides decision-making across operations, investments, risk management, and reporting.

Targets

Specific and measurable sustainability goals set by an organization. Targets are often time-bound and science-based. They track progress toward strategic objectives. Clear targets support accountability.

TCFD (Task Force on Climate-related Financial Disclosures)

The TCFD provides recommendations for disclosing climate-related risks and opportunities. It focuses on governance, strategy, risk management, and metrics and targets. TCFD emphasizes financial impacts of climate change. It has strongly influenced regulatory climate disclosures globally. Many standards and regulations are built on TCFD principles.

Transition Risk

Risks related to the shift toward a low-carbon economy. These include regulatory, technological, and market changes. Transition risks can affect competitiveness. They are central to climate disclosures.

UN Global Compact

The UN Global Compact is a voluntary initiative encouraging businesses to adopt sustainable and socially responsible policies. It is based on ten principles covering human rights, labor, environment, and anti-corruption. Participating companies commit to annual communication on progress. The initiative supports alignment with the UN Sustainable Development Goals. It is commonly referenced in ESG strategies.

UK Sustainability Disclosure Requirements (SDR)

The UK Sustainability Disclosure Requirements establish sustainability disclosure rules for UK companies and financial institutions. The framework aligns with ISSB standards. It focuses on transparency and comparability. UK SDR applies to both corporates and investors. It strengthens sustainability reporting in the UK market.

Verification

A process to check the accuracy and completeness of ESG data. Verification supports credibility and audit readiness. It may be internal or external. Verified data increases stakeholder confidence.

Waste Management

Waste management refers to the processes and systems used to reduce, collect, sort, treat, recycle, and dispose of waste responsibly and efficiently.

In short, waste management helps organizations minimize environmental impact, reduce resource use, comply with regulations, and move toward a circular economy by preventing waste and increasing recycling and reuse.

Under the Greenhouse Gas Protocol, emissions from waste generated in operations and treated by third parties are reported under Scope 3, Category 5.

Zero Waste

A goal focused on eliminating waste sent to landfill. It emphasizes circularity and resource efficiency. Zero waste requires process redesign. It is often part of broader sustainability goals.

The Complete A to Z Dictionary of ESG Terms and Sustainability Definitions

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