Scope 3 Emissions and Your Supply Chain

A manufacturer that has installed solar panels, switched to LED lighting, and procured a 100% renewable electricity tariff may have reduced its Scope 1 and Scope 2 emissions substantially. Its carbon reporting looks credible. And then a customer — a major retailer, a public sector body, a multinational — sends a questionnaire asking for its Scope 3 emissions. The business discovers that its Scope 3 footprint is three to five times larger than its Scope 1 and 2 combined, and that it has no methodology, no data, and no answer.

What Scope 3 Is and Why It Dominates Most Carbon Footprints

The GHG Protocol defines 15 categories of Scope 3 emissions — all the indirect emissions that occur in a company’s value chain but outside its direct operations. For most businesses, the largest Scope 3 categories are: purchased goods and services (the emissions embedded in what you buy), business travel, employee commuting, and — depending on your sector — use of sold products and end-of-life treatment of those products.

The reason Scope 3 dominates most carbon footprints is that manufacturing, processing, and logistics of the goods and services a business purchases typically involve far more energy and emissions than the business’s own operations. A food service business that spends heavily on ingredients, packaging, and logistics will have a Scope 3 footprint from purchased goods alone that dwarfs its Scope 1 and Scope 2 combined.

The 15 Categories: Which Ones Actually Matter for Your Business

The GHG Protocol’s 15 Scope 3 categories can be intimidating. In practice, most businesses have two to four categories that are genuinely material — responsible for 80% or more of their Scope 3 footprint — and the rest are either immaterial or not applicable. For a manufacturing SME, the typically material categories are: Category 1 (purchased goods and services), Category 4 (upstream transportation), Category 11 (use of sold products), and Category 12 (end-of-life treatment of sold products). For a hospitality business, Category 1 (food, beverages, and consumables) and Category 6 (business travel) are likely to dominate.

The practical starting point is a screening exercise — a rough estimate of each category using spend data — to identify which categories are worth measuring properly.

What Your Customers Are Actually Asking For

The Scope 3 requests flowing down supply chains are not, in most cases, asking for a complete 15-category GHG Protocol inventory. They’re asking for one or more of the following: your total Scope 3 footprint (or a reasonable estimate), your carbon intensity, specific category data relevant to your role as a supplier, and your carbon reduction targets and plans.

The largest organisations driving these requests are doing so because their own Scope 3 inventory (Category 1: purchased goods and services) includes your emissions. They need your data to complete their own reporting accurately. If you can’t provide it, they’ll use a spend-based estimate, which is typically less flattering than an activity-based figure would be.

Practical Starting Points for Scope 3 Data Collection

A full Scope 3 inventory is a significant undertaking for an SME without existing data infrastructure. But a defensible starting position is achievable with focused effort. The sequence we recommend: identify your two or three material Scope 3 categories through a spend-based screening; collect activity data for those categories; apply the relevant BEIS/DESNZ emissions factors or industry-standard databases; and document the methodology. The energy procurement connection is that your own well-managed Scope 1 and 2 data is the foundation on which Scope 3 analysis is built.

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FAQ

A major customer has told us we must be Net Zero by 2030 or risk losing the contract. Does that include our Scope 3 emissions? Almost certainly yes, if the customer is applying Science Based Targets initiative (SBTi) standards to their supply chain. SBTi requires companies with Net Zero targets to address Scope 3 emissions if they represent more than 40% of total emissions — and for most businesses, they do. The practical implication is that “Net Zero by 2030” for your Scope 1 and 2 alone is unlikely to satisfy a customer applying rigorous standards.

We’re a small food manufacturer. Category 1 (purchased goods) includes all our ingredients. How do we calculate the emissions embedded in food ingredients? You’ll need emissions factors for each ingredient — kilograms of CO₂e per kilogram of product. BEIS publishes some food emissions factors; more granular data comes from Ecoinvent or sector-specific databases such as the Cool Farm Tool. Start with your highest-spend, highest-volume ingredients and work down. A bill-of-materials approach — calculating the embedded emissions in each product based on its ingredient composition — is the most rigorous methodology.

We’ve heard that Scope 3 Category 11 (use of sold products) could make our carbon footprint look much worse. Is there a way to reduce that? Category 11 is the lifetime energy consumption of a product in use, attributed to the manufacturer at point of sale. For a manufacturer of electric appliances or any energy-consuming product, this is typically the largest single Scope 3 category. The only way to reduce it is to make the product more energy-efficient — which is why product energy efficiency is increasingly a carbon strategy issue rather than just a cost reduction one.