Business Energy Glossary
What are Scope 3 emissions?
Scope 3 emissions are all indirect greenhouse gas emissions in an organisation value chain that are not included in Scope 2. The Greenhouse Gas Protocol defines 15 Scope 3 categories covering upstream supply chain (purchased goods, capital goods, fuel and energy activities, transportation, waste, business travel, employee commuting, leased assets) and downstream activities (transportation, processing, use of sold products, end-of-life treatment, leased assets, franchises, investments). For most organisations, Scope 3 is the largest emissions category, often 5 to 50 times larger than Scope 1 and 2 combined.
Scope 3 has moved from optional to expected reporting under most major climate frameworks. The Science-Based Targets initiative requires Scope 3 targets for organisations with material Scope 3. CDP scoring depends heavily on Scope 3 disclosure quality. Understanding the 15 categories matters for accurate carbon reporting and credible net zero claims.
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The 15 Scope 3 categories
The GHG Protocol Corporate Value Chain (Scope 3) Standard defines 15 categories:
Upstream:
- Purchased goods and services.
- Capital goods.
- Fuel and energy related activities (not in Scope 1 or 2).
- Upstream transportation and distribution.
- Waste generated in operations.
- Business travel.
- Employee commuting.
- Upstream leased assets.
Downstream:
- Downstream transportation and distribution.
- Processing of sold products.
- Use of sold products.
- End-of-life treatment of sold products.
- Downstream leased assets.
- Franchises.
- Investments.
Why Scope 3 matters
Reasons Scope 3 has become central:
- Often the largest share of total emissions (5 to 50 times Scope 1 and 2 combined).
- Required by major climate disclosure frameworks (CDP, SBTi, CFD where material).
- Captures the full carbon impact of products and services, beyond the organisation operations.
- Drives action through the value chain: corporate Scope 3 reduction targets cascade to supplier targets.
For some sectors (financial services, retail, food), Scope 3 is overwhelmingly the dominant category. Net zero strategies that ignore Scope 3 are not credible for these sectors.
Scope 3 data challenges
Scope 3 reporting is harder than Scope 1 and 2:
- Data often must be collected from suppliers (who may not measure their own emissions).
- Spend-based estimation (using average emission factors per pound spent) is approximate.
- Activity-based estimation requires unit-level data that may not be available.
- Boundaries can be unclear (is a subsidiary in Scope 1 or Scope 3?).
- Double-counting risk across value chain participants.
The standard approach combines higher-quality activity data for material categories with spend-based estimation for less material categories.
Common large Scope 3 categories
| Sector | Typically largest Scope 3 |
|---|---|
| Manufacturing | Category 1 (purchased goods), Category 11 (use of sold products) |
| Retail | Category 1 (purchased goods), Category 4 (transportation) |
| Financial services | Category 15 (investments) |
| Food and beverage | Category 1 (purchased goods, particularly agricultural inputs) |
| Energy companies | Category 11 (use of sold products: fuel combustion by customers) |
| Property | Category 13 (downstream leased assets) |
Reducing Scope 3
Scope 3 reduction levers are typically indirect and slower than Scope 1 and 2:
- Supplier engagement. Requesting supplier emissions data, setting supplier reduction targets, including emissions in procurement criteria.
- Product redesign. Reducing material intensity, design for end-of-life, low-carbon material substitution.
- Use-phase efficiency. More efficient products reducing customer Scope 1/2 (which is the manufacturer Category 11 Scope 3).
- Logistics optimisation. Modal shift, route optimisation, lower-emission transport providers.
- Travel and commuting policies. Lower-emission business travel, EV company car schemes, home working.
The Science-Based Targets initiative requires that organisations with Scope 3 above 40 per cent of total emissions set Scope 3 targets covering at least two-thirds of total Scope 3.
Scope 3 in reporting
UK framework requirements for Scope 3:
- SECR. Some Scope 3 categories required (notably business travel for SECR-eligible companies).
- CDP. All 15 categories disclosed where material; comprehensive Scope 3 contributes to higher scores.
- Climate-related Financial Disclosures. Scope 3 where material; specific guidance for financial services on Category 15.
- Science-Based Targets. Required where Scope 3 is more than 40 per cent of total emissions.
The reporting expectation has moved decisively toward comprehensive Scope 3 disclosure for major frameworks since 2022.
Scope 3 emissions FAQs
What are Scope 3 emissions?
All indirect greenhouse gas emissions in an organisation value chain not included in Scope 2. The GHG Protocol defines 15 categories covering upstream supply chain, business travel, employee commuting, downstream product use, and end-of-life treatment.
What are the 15 Scope 3 categories?
Upstream: purchased goods, capital goods, fuel and energy activities, upstream transport, waste, business travel, employee commuting, upstream leased assets. Downstream: downstream transport, processing, use of sold products, end-of-life, downstream leased assets, franchises, investments.
How large is Scope 3 compared to Scope 1 and 2?
Typically 5 to 50 times larger than Scope 1 and 2 combined. For some sectors (financial services, retail, food), Scope 3 is overwhelmingly the dominant category and net zero strategies must address it.
How do I calculate Scope 3?
Two main approaches: activity-based (unit-level data multiplied by emission factor) and spend-based (procurement spend multiplied by industry average emission factor per pound). Activity-based is more accurate; spend-based is more practical for many categories.
Do I have to report Scope 3?
Increasingly yes. SECR requires some categories (notably business travel). CDP, SBTi, and climate-related financial disclosures expect comprehensive Scope 3 disclosure. Voluntary for many UK businesses today but increasingly expected by customers and investors.
How do I reduce Scope 3?
Supplier engagement (data, targets, procurement criteria), product redesign (material intensity, end-of-life), use-phase efficiency, logistics optimisation, and travel policies. Slower than Scope 1/2 reduction because depends on value chain partners.
What is the largest Scope 3 category for most businesses?
Category 1 (Purchased goods and services) is typically the largest for manufacturing and retail. Category 15 (Investments) dominates for financial services. Category 11 (Use of sold products) is largest for energy companies and durable goods manufacturers.
Are downstream emissions Scope 3?
Yes. Categories 9 to 15 cover downstream activities including transportation of sold products, processing, use of sold products, end-of-life treatment, leased assets, franchises, and investments.