The three ESG pillars — Environmental, Social, Governance
ESG is built on three pillars, each covering a distinct set of issues with its own metrics, frameworks and regulatory triggers. Environmental covers climate, nature and resources. Social covers workforce, communities and value chain. Governance covers board, ethics and controls. UK regulation hits all three.
Why three pillars
ESG’s three-pillar architecture has held since the 2004 UN report. Each pillar reflects a distinct category of corporate non-financial risk and opportunity, with its own measurement disciplines, frameworks and regulatory triggers.
Environmental, social and governance issues affect the long-term performance of companies and investors should take them into account on a systematic basis.
UN Global Compact — ‘Who Cares Wins’ (2004)
Climate, nature and resources
The most quantified and most regulated of the three pillars in the UK. Anchored on GHG emissions but extending to nature, water, pollution and the circular economy.
- Climate change and GHG emissions Core topic
- Scope 1 (direct), Scope 2 (purchased energy) and Scope 3 (value chain) emissions, measured using the GHG Protocol Corporate Standard. UK regulatory triggers: SECR for energy and Scope 1/2, TCFD for full TCFD-aligned climate disclosure, emerging UK SRS S2.
- Energy use and efficiency Topic
- Total energy consumption (kWh), energy intensity (per £ turnover or unit of production), efficiency measures undertaken. UK triggers: SECR, ESOS Phase 4. See ESOS guide.
- Biodiversity and ecosystems Emerging topic
- Nature-related dependencies and impacts — species, habitats, ecosystem services. Emerging disclosure framework: TNFD (Taskforce on Nature-related Financial Disclosures, launched September 2023). UK SRS S1 will capture material biodiversity topics under its general framework.
- Water and resource scarcity Topic
- Water consumption, water stress, withdrawal vs return, water-related risks. Increasingly material for utilities, agriculture, mining and food production. CDP Water and SASB industry standards remain the primary reference.
- Pollution and waste Topic
- Air, water and soil pollutants, waste generation and disposal, hazardous materials. UK triggers: Environmental Permitting Regulations, Environment Act 2021, Producer Responsibility Obligations.
- Circular economy Emerging topic
- Material flows, product longevity, recycling and reuse, design for circularity. The EU’s ESRS E5 is the leading disclosure standard; UK SRS S1 captures circular economy where material.
Board, ethics and controls
The pillar where the UK has the longest-established standards. Anchored on the FRC Corporate Governance Code, Companies Act 2006 strategic-report requirements, and FCA Listing Rules.
- Board composition and independence Core topic
- Board size, independence, diversity (gender, ethnicity, expertise), tenure, separation of CEO and Chair. UK triggers: FRC Corporate Governance Code Sections 2 and 3, Parker Review, Hampton-Alexander Review, FCA Listing Rule LR 9.8.6R diversity disclosure.
- Executive remuneration Core topic
- Pay structure, link to performance and ESG, CEO pay ratio, vote on remuneration policy and report. UK triggers: Companies Act 2006 ss.430-422A remuneration report regime, FCA Listing Rules, FRC Corporate Governance Code Section 5.
- Risk management Core topic
- Principal risks and uncertainties, risk appetite, internal controls, audit committee oversight. UK triggers: FRC Corporate Governance Code Section 4, Companies Act 2006 strategic report requirements (s.414C), forthcoming Audit Reform Bill.
- Anti-corruption and ethics Core topic
- Anti-bribery and corruption policy, training coverage, whistleblower mechanisms, ethics breaches. UK triggers: Bribery Act 2010, Public Interest Disclosure Act 1998, Criminal Finances Act 2017.
- Shareholder rights Topic
- One share / one vote, dual-class structures, voting outcomes, engagement with shareholders. UK triggers: Companies Act 2006, UK Stewardship Code, Premium Listing Principles.
- Tax transparency and lobbying Emerging topic
- Country-by-country tax reporting, effective tax rate, lobbying spend, political contributions. Drivers: GRI 207 tax standard, increasing investor demand for tax transparency.
Which pillar matters most? It depends
Materiality varies by industry, geography and business model. A materiality assessment under UK SRS S1 identifies which topics in each pillar are material to the specific company.
Pillar weight varies by sector
Energy and heavy industry: Environmental dominates (climate, water, pollution).
Financial services: Governance dominates (controls, ethics) plus financed emissions under Environmental.
Tech: Social often dominates (workforce, DEI, data privacy) plus Governance.
Healthcare: Social dominates (workforce, product safety, access).
Materiality assessment under UK SRS S1 is the systematic way to determine pillar weight for any specific company.
ESG pillars — frequently asked
The three pillars, which matters most, UK regulatory triggers per pillar, mapping to UK SRS, and pillar-specific metrics.
What are the three pillars of ESG?
Environmental, Social and Governance.
The Environmental pillar covers climate change, GHG emissions, energy, biodiversity, water, pollution and circular economy.
The Social pillar covers workforce, diversity, health and safety, communities, human rights and supply chain labour.
The Governance pillar covers board composition, executive pay, anti-corruption, risk management and shareholder rights.
Which ESG pillar is the most important?
It depends on the industry and the company's material risks.
For energy and heavy industry, Environmental usually dominates.
For services and tech, Social and Governance often carry more weight.
The materiality assessment under UK SRS S1 helps each company identify which ESG topics are most material to enterprise value.
Investors increasingly look at all three together — weak Governance often signals problems in the other pillars.
Which UK regulations cover each ESG pillar?
Environmental: SECR (energy and Scope 1/2 emissions), TCFD via FCA Listing Rules and SI 2022/31 (climate financial disclosure), emerging UK SRS S2 (climate-related).
Social: Modern Slavery Act (supply chain), Gender Pay Gap Reporting Regulations, Workforce Reporting under FRC Corporate Governance Code.
Governance: UK Corporate Governance Code, Companies Act 2006 strategic report, FCA Listing Rules on board composition and remuneration.
How do ESG pillars map to UK SRS standards?
UK SRS S2 (Climate-related Disclosures) covers the climate sub-set of the Environmental pillar.
UK SRS S1 (General Requirements) sets the architecture for all material sustainability topics across all three pillars — biodiversity, water, social topics, governance ethics, human rights.
S1 is proposed comply-or-explain from 2029 for listed companies.
What metrics are used for each ESG pillar?
Environmental: Scope 1/2/3 GHG emissions (GHG Protocol), energy intensity, water consumption, waste diverted from landfill, biodiversity metrics.
Social: gender pay gap, % female board, lost-time injury frequency rate, training hours per FTE, supplier audit coverage.
Governance: % independent directors, board diversity, CEO pay ratio, anti-corruption training coverage, % of votes against management at AGM.
The ESG guide set
From the pillars, continue to the definition, the frameworks, standards, criteria and practical reporting.
What is ESG?
Definition, history from 2004 UN report, UK frameworks and the path to mandatory UK SRS.
CompareESG vs CSR
How ESG evolved from CSR — investor focus, quantification, mandatory disclosure.
FrameworksESG frameworks — UK comparison
UK SRS, GRI, SASB, TCFD, CDP, ESRS / CSRD compared.
StandardsESG standards — UK regulatory landscape
UK SRS, FCA SDR, SECR, SI 2022/31 — the standards-based regime.
CriteriaESG criteria
Practical criteria per pillar — what investors and rating agencies look for.
HubESG reporting — UK hub
Three-layer UK system; UK SRS backbone; preparation roadmap.
Related guides & references
TCFD framework — four pillars + 11 disclosures
The climate-specific framework UK SRS S2 is built on (Environmental pillar deep dive).
GHG Protocol
The calculation methodology underpinning Environmental-pillar emissions disclosures.
UK SRS S1 General Requirements
The materiality framework that determines which pillar topics matter for each company.
Primary references
UN, UK Government, FCA, FRC and standards bodies cited throughout this page.
People, communities and value chain
The hardest pillar to quantify but increasingly material for investor analysis. Covers workforce conditions, communities, human rights and supply chain labour.