What Is the Greenhouse Gas Protocol (GHG Protocol)?
- Aug 7
- 10 min read
If your business is starting to measure its carbon footprint, you will probably come across the Greenhouse Gas Protocol, usually shortened to the GHG Protocol.
It is one of the most widely used foundations for greenhouse gas accounting and provides standards and guidance that help organisations measure and report their emissions in a consistent way.
The GHG Protocol is used by businesses, governments and other organisations around the world.
But what does following the GHG Protocol actually involve, which GHG Protocol standards are relevant to businesses and how does the Corporate Standard fit into your carbon reporting?
In this guide, we'll break down the GHG Protocol into practical terms and explain how it can help you build a more consistent approach to measuring and reporting your greenhouse gas emissions.
What Is the GHG Protocol?
The Greenhouse Gas Protocol provides standards and guidance for measuring and reporting greenhouse gas emissions.
Its standards create a common framework that businesses and other organisations can use when building their greenhouse gas inventories.
Rather than every organisation developing a completely different way to calculate its footprint, the GHG Protocol provides recognised approaches and principles for accounting and reporting.
For businesses, this can help answer important questions such as:
Which emissions should we measure?
Which parts of the organisation should be included?
How should different emissions be categorised?
How should we calculate and report those emissions?
How can we keep our approach consistent between reporting years?
The GHG Protocol is also where the familiar terms Scope 1, Scope 2 and Scope 3 come from, giving organisations a structured way to distinguish between different types of direct and indirect emissions.
If you're building your first greenhouse gas inventory, Scope can help you bring your emissions data together and start creating a clearer picture of your business carbon footprint.
What Are the GHG Protocol Standards?
There isn't just one GHG Protocol standard.
The GHG Protocol provides a collection of standards and supporting guidance designed for different greenhouse gas accounting purposes.
For a business measuring its organisational carbon footprint, some are particularly important.
These include:
The Corporate Accounting and Reporting Standard
The Corporate Value Chain (Scope 3) Standard
The Product Life Cycle Accounting and Reporting Standard
Scope 2 Guidance
Scope 3 Calculation Guidance
The standard you need depends on what you're trying to measure.
For example, a company developing an organisation-wide greenhouse gas inventory will primarily look towards the Corporate Standard.
A business looking more deeply into value chain emissions can use the Scope 3 Standard and its supporting calculation guidance.
A company measuring emissions associated with an individual product would instead look towards the Product Standard.
This distinction is important because saying that something follows the "GHG Protocol" can refer to a wider collection of standards and guidance.
What Is the GHG Protocol Corporate Standard?
The GHG Protocol Corporate Standard is the part most businesses are likely to encounter when they begin measuring their organisation's greenhouse gas emissions.
Its full name is the GHG Protocol Corporate Accounting and Reporting Standard.
It provides requirements and guidance for companies and other organisations preparing a corporate-level greenhouse gas emissions inventory.
According to the GHG Protocol, its objectives include helping companies create a true and fair account of their emissions through standardised approaches while increasing consistency and transparency in greenhouse gas accounting and reporting.
The Corporate Standard covers seven greenhouse gases:
Carbon dioxide (CO2)
Methane (CH4)
Nitrous oxide (N2O)
Hydrofluorocarbons (HFCs)
Perfluorocarbons (PFCs)
Sulphur hexafluoride (SF6)
Nitrogen trifluoride (NF3)
This is one reason why carbon footprints are commonly expressed as carbon dioxide equivalent, or CO2e.
Different greenhouse gases have different warming effects, so expressing them in a common unit allows them to contribute to an overall emissions inventory.
What Is a Greenhouse Gas Inventory?
A greenhouse gas inventory is a structured record of the greenhouse gas emissions associated with an organisation over a particular reporting period.
You can think of it as the foundation behind your reported carbon footprint.
Rather than simply producing one final CO2e figure, an inventory records and organises the emissions included within your reporting boundary.
For a business, this could involve information relating to:
Fuel used in company vehicles
Gas used in buildings
Purchased electricity
Business travel
Employee commuting
Waste
Purchased goods and services
Transportation and distribution
Other relevant value chain activities
The Corporate Standard is specifically designed to help organisations prepare this type of corporate-level GHG emissions inventory.
For UK businesses, activity data such as fuel consumed, electricity purchased and distance travelled can be converted into greenhouse gas emissions using appropriate conversion factors.
The UK Government publishes company reporting conversion factors annually for this purpose.
Already collecting emissions data in different spreadsheets and systems? Scope helps bring your carbon information into one place, making it easier to build and manage your greenhouse gas inventory over time.
How Does the GHG Protocol Define Scope 1, 2 and 3?
One of the best-known parts of the GHG Protocol is its use of Scope 1, Scope 2 and Scope 3 emissions.
These categories help organisations understand where emissions occur and their relationship to the reporting company.
Scope 1: Direct Emissions
Scope 1 covers direct greenhouse gas emissions from sources owned or controlled by the reporting organisation.
For a business, examples could include fuel burned in company-owned vehicles or combustion within boilers and other equipment.
Scope 2: Purchased Energy
Scope 2 covers indirect emissions associated with purchased or acquired electricity, steam, heat and cooling.
The GHG Protocol's Scope 2 Guidance provides additional requirements and guidance for how companies account for these emissions.
Scope 3: Value Chain Emissions
Scope 3 covers indirect emissions occurring across an organisation's value chain.
Depending on the business, this can include areas such as purchased goods and services, transportation, business travel, employee commuting and waste.
Scope 3 can be particularly challenging because much of the information required may sit outside your organisation.
This means businesses can depend on suppliers and other third parties for data.
How Do Businesses Use the GHG Protocol?
Understanding the definitions is useful, but the GHG Protocol becomes much more valuable when you apply it to your actual carbon reporting.
A business following the Corporate Standard needs to make decisions about what its greenhouse gas inventory covers and how its emissions will be accounted for.
The Corporate Standard addresses areas including:
GHG accounting and reporting principles
Inventory design
Organisational boundaries
Operational boundaries
Tracking emissions over time
Identifying and calculating emissions
Reporting greenhouse gas emissions
For example, setting an organisational boundary helps determine which operations sit inside your inventory.
Under the Corporate Standard, businesses can consolidate emissions using an equity share approach or a control approach.
Under a control approach, control can be defined in financial or operational terms.
This can sound technical when you're new to carbon accounting, but the underlying question is straightforward:
Which parts of our organisation are we responsible for including in this greenhouse gas inventory?
Establishing that consistently is important.
Without a defined boundary, it becomes much harder to compare emissions meaningfully between reporting periods.
What Are the GHG Protocol Accounting Principles?
The Corporate Standard is designed around a set of accounting and reporting principles that help organisations produce useful and credible GHG inventories.
These are:
Relevance
Completeness
Consistency
Transparency
Accuracy
Relevance means your inventory should appropriately reflect your organisation's emissions and support decision-making.
Completeness means relevant emissions within your chosen inventory boundary should be accounted for, with exclusions disclosed and explained.
Consistency means methodologies should allow meaningful comparisons over time, with changes documented transparently.
Transparency means assumptions, methodologies and data should be disclosed clearly enough to create a factual and understandable record.
Accuracy means organisations should work to reduce uncertainty and ensure reported emissions are neither systematically overstated nor understated.
These principles are important because good GHG reporting is about more than producing a calculation.
Your organisation should be able to understand what is included in that calculation, how it was reached and whether the same approach can be applied consistently in future reporting periods.
Good carbon reporting needs more than a final CO2e figure. Scope helps you keep your emissions information organised and traceable, giving your team greater visibility over the data behind your footprint.
Does the GHG Protocol Cover Scope 3?
Yes, but there is an important distinction between the Corporate Standard and the separate Corporate Value Chain (Scope 3) Standard.
The Corporate Standard establishes the Scope 1, Scope 2 and Scope 3 framework.
The separate Corporate Value Chain (Scope 3) Standard provides the framework for companies completing a corporate-level Scope 3 inventory across 15 value chain categories.
The Scope 3 Standard can help organisations look beyond emissions from their own operations and purchased energy to understand their wider value chain impact.
This is particularly useful because some businesses can find that significant emissions sit within their supply chain rather than their own buildings or vehicles.
The GHG Protocol also provides separate Scope 3 Calculation Guidance to help businesses calculate emissions across these categories.
What Is GHG Protocol Scope 2 Guidance?
Scope 2 also has dedicated guidance.
The GHG Protocol Scope 2 Guidance standardises how companies measure emissions from purchased or acquired electricity, steam, heat and cooling.
It provides requirements for accounting for energy contracts and instruments and recommendations for transparently disclosing information about energy purchases.
The guidance is required for companies following the Corporate Standard.
This matters because purchased electricity isn't always as straightforward as taking the number of kilowatt-hours used and producing a single emissions figure.
Depending on the market and available contractual information, businesses may encounter both location-based and market-based Scope 2 accounting.
What Does GHG Protocol Compliance Mean?
You may see carbon accounting platforms, consultants and businesses using phrases such as "GHG Protocol compliant" or "aligned with the GHG Protocol."
It's useful to look beyond the phrase itself and understand what methodology is actually being followed.
For corporate GHG reporting, this could include whether the organisation:
Has established appropriate reporting boundaries
Categorises emissions consistently
Applies the relevant Scope 1, 2 and 3 guidance
Uses appropriate emissions calculation methodologies
Keeps its approach consistent between reporting periods
Clearly documents assumptions, exclusions and changes
Reports information transparently
The GHG Protocol itself provides the accounting standards and guidance.
It should therefore be treated as the methodology behind your emissions inventory, rather than simply a badge to add to a carbon report.
For businesses choosing carbon tracking software, it's worth asking exactly how the platform applies the GHG Protocol and what information you can see behind its calculations.
How Does the GHG Protocol Support Annual Carbon Reporting?
The real benefit of a consistent accounting framework becomes clearer when carbon reporting happens year after year.
Imagine one business calculates its electricity emissions one way in 2026 and uses a completely different approach in 2027 without documenting the change.
Even if both final figures look precise, comparing them could be misleading.
Using a consistent GHG accounting approach helps create continuity between reporting periods.
That means businesses can more confidently:
Compare emissions year on year
Monitor changes in Scope 1, 2 and 3
Understand why emissions have increased or decreased
Maintain clearer records behind reported figures
Identify carbon hotspots
Use their emissions data to support reduction planning
UK Government conversion factors are also updated annually.
This makes documenting the methodology and factors used in each reporting period particularly important.
Preparing for annual carbon reporting? Scope helps you track emissions throughout the year, so you're building your carbon data as you go rather than starting from scratch when reporting time arrives.
Do UK Businesses Have to Follow the GHG Protocol?
The GHG Protocol is a greenhouse gas accounting framework, not itself a UK law.
Whether your business has mandatory carbon or sustainability reporting requirements depends on factors such as the organisation, its size and the regulations or reporting frameworks that apply to it.
However, the GHG Protocol can provide a recognised methodology for measuring emissions.
For businesses that aren't currently subject to mandatory reporting, using a consistent methodology can still be useful.
You may want emissions information for:
Internal sustainability reporting
Customer or supplier requests
Tenders and procurement
Setting carbon reduction targets
Understanding your carbon hotspots
Preparing for future reporting needs
So the question isn't only:
Do we legally have to use the GHG Protocol?
It can also be:
Would following an established GHG accounting framework improve the consistency and usefulness of our carbon data?
Is the GHG Protocol Changing?
The GHG Protocol is currently updating its corporate suite of standards and guidance.
The update process covers the Corporate Standard, Scope 2 Guidance, Scope 3 Standard and supporting documents.
That means businesses should use the current published standards while keeping an eye on official GHG Protocol updates as the revised framework develops.
How Can Carbon Tracking Software Support GHG Reporting?
As your greenhouse gas inventory grows, managing the information behind it can become just as important as calculating the emissions themselves.
You may need to bring together energy information, fuel use, travel, waste, supplier data and other activities while maintaining a consistent methodology between reporting periods.
Carbon tracking software can help by giving businesses a structured place to manage this information.
When choosing a platform, consider whether it can help you:
Organise Scope 1, 2 and 3 emissions
Apply appropriate emission factors
Keep records of the data behind calculations
Monitor emissions across reporting periods
Identify carbon hotspots
Manage information from different areas of the organisation
Prepare emissions information for reporting
Software doesn't remove the need to understand your reporting boundaries or the standards relevant to your organisation.
What it can do is make the underlying data much easier to manage.
Scope makes carbon tracking more accessible by helping businesses bring emissions data together, understand their footprint and build a clearer approach to ongoing GHG reporting.
GHG Protocol FAQs
What Does GHG Protocol Stand For?
GHG Protocol stands for Greenhouse Gas Protocol. It provides widely used standards and guidance for measuring and reporting greenhouse gas emissions.
What Is the GHG Protocol Corporate Standard?
The GHG Protocol Corporate Accounting and Reporting Standard provides requirements and guidance for companies and other organisations preparing a corporate-level greenhouse gas emissions inventory.
What Are the Main GHG Protocol Standards?
The GHG Protocol provides several standards for different accounting purposes. These include the Corporate Standard, Corporate Value Chain (Scope 3) Standard and Product Life Cycle Standard, alongside supporting guidance such as the Scope 2 Guidance and Scope 3 Calculation Guidance.
What Is a Greenhouse Gas Inventory?
A greenhouse gas inventory is an organised account of the GHG emissions included within an organisation's defined reporting boundary and reporting period. It provides the underlying structure businesses use to understand and report their emissions.
Does the GHG Protocol Include Scope 1, 2 and 3?
Yes, the GHG Protocol uses Scope 1, Scope 2 and Scope 3 to categorise direct emissions, emissions associated with purchased energy and other indirect value chain emissions.
Is the GHG Protocol Mandatory in the UK?
The GHG Protocol itself is not UK legislation. Businesses need to determine which legal and reporting requirements apply to their organisation separately. The Protocol provides an accounting framework that can be used to measure and report greenhouse gas emissions.
Is the GHG Protocol Being Updated?
Yes. The GHG Protocol is currently updating its corporate suite of standards and guidance, including the Corporate Standard, Scope 2 Guidance and Scope 3 Standard.
Start Building a Clearer GHG Inventory With Scope
The GHG Protocol gives businesses a recognised structure for measuring and reporting greenhouse gas emissions.
But applying that structure still depends on having good-quality carbon data behind it.
You need to know what you're measuring, where the information came from and how your emissions change over time.
That's where ongoing carbon tracking becomes valuable.
Scope Carbon Tracking helps businesses bring their emissions information together, understand Scope 1, 2 and 3 and create a clearer picture of their carbon footprint.
Whether you're building your first greenhouse gas inventory or improving an established reporting process, we're here to make carbon tracking easier to understand and manage.
Explore Scope Carbon Tracking and start building a more structured approach to measuring and reporting your business emissions.
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