CSRD vs ESG vs GHG Protocol: What's the Difference?

If you have spent any time researching carbon reporting, you have probably encountered four acronyms that seem related but are used interchangeably in ways that make no sense: CSRD, ESG, GHG Protocol, and ESRS VSME.

They are not the same thing. Each plays a different role — and confusing them leads to wasted effort or reports that miss the mark. This guide untangles all four in plain English.

The One-Line Summary

• ESG — the topic (what you report on)
• GHG Protocol — the measurement method (how you calculate it)
• ESRS VSME — the reporting standard (how you format it)
• CSRD — the EU law (why you have to do it)

Think of it like filing taxes: ESG is your financial performance, GHG Protocol is your accounting method, ESRS VSME is the tax form template, and CSRD is the law that says you must file.

ESG — The Topic

ESG stands for Environmental, Social, and Governance. It is a framework for thinking about business performance beyond financial results.

• Environmental (E) — carbon footprint, energy use, waste, water, biodiversity impact
• Social (S) — employees, diversity, community impact, health and safety
• Governance (G) — management structure, ethics, anti-corruption, transparency

ESG is not a regulation. It is not a standard. It is a category of information — a way of grouping non-financial metrics that investors, customers, and regulators care about.

When someone says “we need an ESG report,” they mean they need a document disclosing their performance across these three dimensions. The carbon footprint falls under the E — and is usually the most technically demanding part.

GHG Protocol — The Measurement Method

The Greenhouse Gas Protocol (GHG Protocol) is the globally accepted accounting standard for measuring and reporting greenhouse gas emissions. It was developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD).

The GHG Protocol defines:

• The three scopes — Scope 1 (direct), Scope 2 (purchased electricity), Scope 3 (value chain) — which are now used by virtually every carbon reporting framework
• Organisational boundaries — which emissions to include based on ownership or operational control
• Calculation methodology — activity data × emission factor = CO₂e

The GHG Protocol is not a regulation. It is not specific to the EU. It is a voluntary standard — but it is referenced as the required methodology by CSRD, CDP, the Science Based Targets initiative (SBTi), and almost every other major ESG framework.

In practice: when you calculate your carbon footprint using DEFRA 2024 emission factors and the Scope 1/2/3 framework, you are using the GHG Protocol methodology. EmissionPlan is built on this standard.

ESRS VSME — The Reporting Standard for EU SMBs

ESRS stands for European Sustainability Reporting Standards. VSME stands for Voluntary SME standard — the simplified version designed specifically for small and medium businesses.

ESRS VSME tells you how to structure and presentyour ESG disclosures — what sections to include, what metrics to report, and what language to use. It is the EU's answer to the question: “What should an SMB sustainability report actually look like?”

Key things ESRS VSME specifies for the environmental section:

• Report Scope 1 and Scope 2 as a minimum; Scope 3 encouraged
• Use a recognised accounting standard (i.e. GHG Protocol)
• State your emission factors and their source
• Include your reporting period and organisational boundary

EmissionPlan's generated PDF report is structured to meet ESRS VSME requirements and explicitly references the standard in the methodology section.

CSRD — The EU Law

The Corporate Sustainability Reporting Directive (CSRD) is EU legislation that makes ESG reporting mandatory for qualifying companies. It is the law that creates the legal obligation — the other three terms describe what and how you report, not whether you must.

CSRD requires companies to:

• Produce an annual sustainability report (covering E, S, and G)
• Follow ESRS standards (including ESRS VSME for SMBs)
• Use GHG Protocol methodology for carbon calculations
• Have the report reviewed by an auditor

So CSRD is the law, ESRS VSME is the standard the law references, GHG Protocol is the methodology that standard requires, and ESG is the category of information being reported. They form a chain.

How They Fit Together

Here is a practical example for a 60-person manufacturing company in Germany:

1. CSRD applies — 60 employees and €15M revenue means they are in scope for CSRD reporting by 2026.
2. They need an ESG report — covering their carbon footprint (E), employee data (S), and governance policies (G).
3. They use GHG Protocol to calculate the carbon footprint — measuring Scope 1 (gas, vehicles), Scope 2 (electricity with German grid factor), and Scope 3 (travel, commuting, waste).
4. They structure the report to ESRS VSME — using the correct sections, metrics, and disclosure language.
5. They submit to their auditor — who confirms it meets CSRD requirements.

The carbon footprint section — steps 3 and 4 — is where most SMBs spend 80% of their time. EmissionPlan handles both: GHG Protocol-aligned calculation and ESRS VSME-formatted PDF output, in under 5 minutes.

Quick Reference

• Do I have to report? → CSRD tells you
• What do I report on? → ESG framework
• How do I calculate emissions? → GHG Protocol
• How do I format the report? → ESRS VSME
• What emission factors do I use? → DEFRA 2024 (accepted across EU)