Scope 3 emissions are the indirect greenhouse gas emissions in a company's value chain. Scope 1 covers direct emissions from sources the company owns or controls, Scope 2 covers purchased energy, and Scope 3 covers everything else, from the goods and services you buy through to how customers use what you sell.
For most organisations Scope 3 is both the largest part of the footprint and the hardest part to measure, because the data belongs to other companies. It runs from purchased materials to the end of life treatment of your products.
Put simply, Scope 3 emissions are all the emissions you are responsible for but do not directly create. That includes your supply chain, business travel, employee commuting, and how customers use your products.
Measuring them is the part every reporting standard now asks about, and the part most programmes stall on.
Why is Scope 3 a priority now?
Scope 3 sits inside reporting requirements, procurement decisions and investor questions at the same time. Three reasons it moves up the list:
- It is where the emissions are. For most organisations the value chain is a larger source than everything they own and operate.
- Reporting standards ask for it by category, and ask how much of the total rests on primary data rather than averages.
- It is the part you can only move with other organisations, which makes supplier and portfolio engagement the work rather than an add on.
The obstacle has always been data. Gathering figures from hundreds or thousands of suppliers by hand pushes teams onto proxy data and averages that an auditor will question, and by the time the spreadsheet is finished the year has moved on.
The 15 categories of Scope 3
The GHG Protocol splits Scope 3 into 15 categories so an organisation can map its value chain and see where the emissions sit. Categories 1 to 8 are upstream, categories 9 to 15 are downstream.
Upstream categories
These cover the goods, services and activities that reach your organisation.
1. Purchased goods and services: emissions from the production of all the products and services you buy.
2. Capital goods: emissions from producing capital goods like machinery, buildings, and vehicles.
3. Fuel and energy related activities: emissions from the production of fuels and energy you have purchased and consumed (not already covered in Scope 1 or 2).
4. Upstream transportation and distribution: emissions from transporting and distributing products from your Tier 1 suppliers to your own facilities.
5. Waste generated in operations: emissions from disposing of waste created in your operations.
6. Business travel: emissions from employee travel for business purposes, including flights, trains and hotels.
7. Employee commuting: emissions from your employees' travel between their homes and their workplaces.
8. Upstream leased assets: emissions from operating assets that you lease.
Downstream categories
These cover what happens to your products and services after they leave you.
9. Downstream transportation and distribution: emissions from transporting and distributing products to the end consumer.
10. Processing of sold products: emissions from the processing of your intermediate products by other companies.
11. Use of sold products: emissions from the use of your products by consumers.
12. End-of-life treatment of sold products: emissions from the disposal and treatment of your products after they are used.
13. Downstream leased assets: emissions from the operation of assets you own and lease to others.
14. Franchises: emissions from the operation of your franchises.
15. Investments: emissions associated with your financial investments.
From chasing suppliers to auditable numbers
The old way of running Scope 3 was chasing suppliers, holding the result in a master spreadsheet, filling the gaps with industry averages, and defending the total to an auditor months later. Teams describe it as heads in spreadsheets, and the answer arrives too late to change a sourcing decision.
OLD: chase suppliers, master spreadsheet, industry averages, audit ping pong, top 50 suppliers only.
NEW: verified supplier and portfolio data in one place, continuous refresh with documented sources, evidence attached to every figure.
Consolidating verified data from disclosures, filings and direct submissions gives you one source of truth with the provenance attached, so a figure can be traced to its document without anyone reopening the exercise. Numbers you can defend within 2 weeks, then a quarterly rhythm rather than an annual scramble.
That frees the team for the work that changes the number: engaging the organisations that matter, finding the reduction opportunities, and tracking whether they land. The calculator behind the figures is verified to ISO 14064-3, limited assurance, by UL Solutions, renewed annually: see the reports in our trust centre.