The GHG Protocol is the most widely used international framework for measuring and managing greenhouse gas emissions. Developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), it provides the foundational standard for corporate carbon accounting across industries and geographies.
Whether your company is preparing for CSRD reporting, setting science-based targets, or simply trying to understand its environmental impact, the GHG Protocol is where carbon accounting begins.
What is the GHG Protocol?
The GHG Protocol establishes standardised frameworks for measuring greenhouse gas emissions at the corporate and product level. First published in 2001, it has become the de facto global standard , used by over 90% of Fortune 500 companies that report their emissions.
The protocol covers all seven greenhouse gases defined by the Kyoto Protocol: carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), sulphur hexafluoride (SF₆), and nitrogen trifluoride (NF₃). All emissions are expressed in metric tonnes of CO₂ equivalent (tCO₂e).
The three scopes of emissions
The GHG Protocol’s most important contribution is the classification of emissions into three scopes, which together capture a company’s complete carbon footprint.
Scope 1: Direct emissions
Scope 1 emissions come from sources owned or controlled by the company. These include:
- Fuel combustion in company vehicles
- On-site heating from natural gas boilers
- Industrial processes that release GHGs
- Refrigerant leaks from HVAC systems
For manufacturing and transport companies, Scope 1 is often the largest emissions category. For service-based businesses, it typically represents a smaller share.
Scope 2: Energy indirect emissions
Scope 2 emissions result from the generation of purchased electricity, steam, heating, and cooling. The GHG Protocol requires companies to report Scope 2 using two methods:
- Location-based: Uses average grid emission factors for the region
- Market-based: Uses emission factors from contractual instruments (RECs, PPAs, green tariffs)
Reporting both methods gives stakeholders a complete picture of electricity-related emissions.
Scope 3: Value chain emissions
Scope 3 emissions cover everything else , all indirect emissions across the value chain. The GHG Protocol defines 15 categories, split between upstream (purchased goods, business travel, employee commuting) and downstream (use of sold products, end-of-life treatment).
For most companies, Scope 3 represents 70–90% of total emissions. It is also the hardest to measure, requiring data from suppliers, customers, and third parties.
Key standards within the GHG Protocol
The GHG Protocol is not a single document but a family of standards:
Corporate Standard
The foundational framework for company-level GHG inventories. It covers how to set organisational and operational boundaries, choose a base year, collect data, and report emissions across all three scopes.
Scope 3 Standard (Corporate Value Chain)
Published in 2011, this standard provides detailed guidance for quantifying Scope 3 emissions across all 15 categories. It includes calculation approaches ranging from spend-based estimates to supplier-specific data.
Product Standard
Focuses on the lifecycle emissions of individual products, using life cycle assessment (LCA) methodologies. Useful for Environmental Product Declarations (EPDs) and product carbon footprints (PCFs).
Project Protocol
Quantifies GHG reductions from specific mitigation projects, used primarily for carbon offset verification.
How the GHG Protocol connects to CSRD
The Corporate Sustainability Reporting Directive (CSRD) requires companies to disclose their climate impact following the European Sustainability Reporting Standards (ESRS). Under ESRS E1 (Climate change), emissions must be reported using GHG Protocol methodologies.
Specifically, CSRD-compliant reports must include:
- Scope 1 emissions (mandatory)
- Scope 2 emissions using both location-based and market-based methods (mandatory)
- Material Scope 3 categories (mandatory where material)
- A base year and explanation of methodology
- Emission intensity metrics
Companies already reporting under the GHG Protocol have a strong foundation for CSRD compliance. However, CSRD adds requirements around transition plans, targets, and governance that go beyond pure emission measurement.
Getting started with GHG Protocol reporting
The typical process for a first GHG inventory follows these steps:
- Define boundaries , Choose between equity share and operational control approaches
- Identify emission sources , Map all relevant sources across Scopes 1, 2, and 3
- Collect activity data , Gather fuel consumption, electricity use, travel records, procurement data
- Apply emission factors , Multiply activity data by scientifically validated factors
- Calculate and verify , Aggregate results and conduct quality checks
- Report and improve , Disclose findings and set reduction targets
Automating GHG Protocol reporting
Manual carbon accounting is time-consuming and error-prone. Modern ESG platforms automate the process by connecting directly to data sources , ERPs, utility providers, fleet management systems , and applying region-specific emission factors automatically.
Dcycle’s platform streamlines GHG Protocol reporting by automating data collection across all three scopes, calculating emissions using verified databases, and generating audit-ready reports aligned with both GHG Protocol and CSRD requirements.
Key takeaways
- The GHG Protocol is the global standard for corporate greenhouse gas accounting
- Three scopes capture direct emissions (1), energy (2), and value chain (3)
- Scope 3 typically represents the majority of a company’s footprint
- CSRD requires GHG Protocol-aligned emissions reporting under ESRS E1
- Automation platforms significantly reduce the time and cost of compliance
