Scope 3 Emissions: A Complete Guide to All 15 Categories

Why the Majority of Your Carbon Footprint Is Hiding in Your Value Chain

Most companies have a reasonable handle on their Scope 1 and Scope 2 emissions. They know what fuels they burn directly, and they can account for the electricity they purchase. These numbers sit neatly within the boundaries of their own operations and are relatively straightforward to measure and report.

But for the vast majority of businesses, Scope 1 and Scope 2 together represent less than 30% of their total carbon footprint. The remaining 70% or more sits in Scope 3, spread across a complex web of suppliers, logistics partners, customers, employees, and investors that extends far beyond the company's own walls.

Scope 3 is where the real climate accountability lies. It is also where most organisations are still barely scratching the surface.

What is Scope 3?

The Greenhouse Gas Protocol, the internationally recognised standard for corporate emissions accounting, divides emissions into three scopes. Scope 1 covers direct emissions from sources owned or controlled by the company. Scope 2 covers indirect emissions from purchased energy. Scope 3 covers all other indirect emissions that occur across a company's value chain, both upstream and downstream.

The GHG Protocol defines 15 distinct categories within Scope 3, divided between upstream activities, meaning what happens before a product reaches the company, and downstream activities, meaning what happens after a product leaves the company. Under frameworks such as CSRD and the European Sustainability Reporting Standards, companies are required to assess and disclose all Scope 3 categories that are material to their business.

Understanding what each category covers, and why it matters, is the foundation of any credible Scope 3 strategy.

Upstream Categories

Upstream Scope 3 categories capture the emissions embedded in everything that flows into a company's operations, from raw materials and purchased goods to the daily commutes of its workforce.

Category 1: Purchased Goods and Services

This is the emissions generated in producing everything a company buys. Raw materials, components, packaging, professional services, software subscriptions, office supplies, and any other goods or services procured externally all fall within this category. For most businesses, Category 1 is the single largest component of their Scope 3 footprint, and in many cases the single largest component of their total emissions across all three scopes. Getting a handle on Category 1 requires deep engagement with supplier emissions data, which is why supply chain decarbonisation has become such a critical topic for procurement and sustainability teams alike.

Category 2: Capital Goods

Capital goods refers to the emissions associated with manufacturing the equipment, machinery, buildings, vehicles, and infrastructure that a company purchases and uses over time. Unlike purchased goods and services, which are consumed relatively quickly, capital goods have long useful lives, and the emissions from their production are allocated to the purchasing company over that lifetime. For capital-intensive industries such as manufacturing, construction, and logistics, this category can be substantial.

Category 3: Fuel and Energy Related Activities

This category captures emissions from the extraction, production, and transportation of fuels and energy that a company consumes, but which are not already counted in Scope 1 or Scope 2. This includes the upstream emissions associated with mining coal, extracting and refining oil and gas, and transmitting electricity through the grid. It is a category that is easy to overlook precisely because it sits in the gap between what companies directly control and what they directly purchase, but it can represent a meaningful share of the overall footprint for energy-intensive operations.

Category 4: Upstream Transportation and Distribution

Every time goods are moved toward a company, whether raw materials arriving at a manufacturing facility, components shipped to an assembly plant, or products delivered to a distribution centre, those transport emissions belong in Category 4. This includes road freight, rail, air cargo, and ocean shipping, as well as storage in third-party warehouses along the supply chain. For companies with global supply chains, Category 4 can be a significant source of emissions and an area where supplier engagement and logistics optimisation can deliver real reductions.

Category 5: Waste Generated in Operations

The emissions generated by disposing of waste that a company's own operations produce fall under Category 5. This covers solid waste sent to landfill, waste incinerated with or without energy recovery, wastewater treatment, and materials sent for recycling. The emissions in this category arise not from the company's own facilities but from the waste management infrastructure and facilities that handle the waste downstream. Reducing waste at source and diverting materials from landfill are the primary levers for managing Category 5 emissions.

Category 6: Business Travel

Every flight taken by an employee on company business, every hotel stay, every rental car, every train journey for a client meeting or conference contributes to Category 6. For professional services firms, consultancies, law firms, and technology companies with globally dispersed operations, business travel can represent one of the more significant and visible components of the Scope 3 footprint. It is also an area where companies have direct influence through travel policies, virtual meeting culture, and clear guidelines around when travel is genuinely necessary.

Category 7: Employee Commuting

The daily journeys that employees make between home and their place of work generate Category 7 emissions. These emissions are outside the direct control of the company but are linked to its operations through the simple fact that it requires people to show up at a physical location. For large IT and technology companies with significant headcounts, employee commuting can account for between 20% and 40% of total Scope 3 emissions. Despite this, it rarely appears in sustainability reports with any meaningful data behind it. Conducting an employee commuting survey is the essential first step toward understanding and managing this category.

Category 8: Upstream Leased Assets

Where a company leases assets that it operates itself, but which are not included in its Scope 1 and Scope 2 boundary, the emissions from operating those assets fall under Category 8. This typically applies when companies use equity consolidation rather than operational control as their organisational boundary for emissions reporting, and when leased assets are not already captured elsewhere in the inventory.

Downstream Categories

Downstream Scope 3 categories capture what happens to a company's products and influence after they leave its direct control, from the logistics that carry them to customers to what happens when those customers are finished with them.

Category 9: Downstream Transportation and Distribution

Once products leave a company's ownership and are transported toward end customers through third-party logistics providers, retailers, or distributors, those transport emissions fall under Category 9. For consumer goods companies, food and beverage manufacturers, and any business that sells through extended distribution networks, Category 9 can be a material source of emissions that requires active collaboration with logistics partners to measure and reduce.

Category 10: Processing of Sold Products

Some companies sell intermediate goods that require further processing by their customers before reaching the end consumer. The emissions generated by that downstream processing fall under Category 10. This category is particularly relevant for companies in the chemicals, materials, and components sectors, where what is sold is an input to someone else's manufacturing process rather than a finished product.

Category 11: Use of Sold Products

Category 11 captures the emissions generated when customers actually use the products a company has sold them. For some sectors, this is the dominant source of Scope 3 emissions by a significant margin. An automotive manufacturer's largest Scope 3 category is almost certainly the fuel burned by all the vehicles it has ever sold. An appliance manufacturer must account for the lifetime electricity consumption of every washing machine, refrigerator, and dishwasher in the hands of its customers. For technology companies, the energy consumed by software running on customer hardware, and by the hardware itself, contributes to Category 11. Designing products that are more energy efficient is one of the most powerful levers a company has for reducing its overall climate impact.

Category 12: End of Life Treatment of Sold Products

What happens to a product when a customer is finished with it belongs in Category 12. This covers emissions from landfilling, incineration, recycling, and any other end-of-life process that the product goes through after it leaves the final customer. For technology and electronics companies, this is closely tied to the global e-waste crisis. Products that end up in informal recycling operations in developing countries generate toxic waste and carbon emissions that trace directly back to the decisions made in product design and the absence of take-back and recycling programmes. Extended producer responsibility regulations in multiple jurisdictions are increasingly making Category 12 not just an environmental concern but a financial and legal one.

Category 13: Downstream Leased Assets

Where a company owns assets that it leases out to others for their use, the emissions from operating those assets fall under Category 13. This category is the downstream counterpart to Category 8 and is relevant for companies in real estate, equipment leasing, and similar sectors where the core business model involves owning assets that others operate.

Category 14: Franchises

For companies that operate franchise models, Category 14 captures the emissions generated by franchisees operating under the brand. The franchisor does not directly control these operations, but it exerts significant influence through standards, specifications, equipment requirements, and operational guidelines. Franchise emissions can represent a substantial and underreported share of total footprint for companies in fast food, retail, hospitality, and other franchise-heavy sectors.

Category 15: Investments

Category 15 is the Scope 3 category that matters most to banks, insurance companies, pension funds, and other financial institutions. It captures the emissions associated with the loans, equity investments, bonds, and other financial instruments that an institution holds in its portfolio. When a bank finances a coal-fired power plant, the emissions from that plant are linked to the bank through Category 15. When a pension fund holds equity in a high-emission industrial company, a share of that company's emissions sits in the fund's Category 15 footprint. This category has driven the emergence of financed emissions as a central topic in sustainable finance, and it is the foundation of initiatives such as the Partnership for Carbon Accounting Financials.

Why Scope 3 Cannot Be Ignored

The regulatory direction is unambiguous. CSRD requires companies to conduct a Double Materiality Assessment that covers all relevant Scope 3 categories. The European Sustainability Reporting Standards provide detailed guidance on how each category should be assessed, measured, and disclosed. Companies that report only Scope 1 and Scope 2 are producing an incomplete picture of their climate impact, one that regulators, investors, and sophisticated customers are increasingly equipped to identify as such.

Beyond compliance, Scope 3 measurement matters because it reflects reality. A company cannot genuinely claim to be addressing its climate impact while ignoring the emissions embedded in its supply chain, the energy consumed by its products in use, and the consequences of its financing activities. These emissions are real, they are significant, and they are connected to business decisions that organisations make every day.

The companies that will build genuinely credible, resilient, and future-proof ESG strategies are those that lean into the complexity of Scope 3 rather than avoiding it. The data challenges are real but solvable. The stakeholder expectations are rising and will not reverse. The question is not whether to measure Scope 3. The question is how soon to start and how seriously to take it.

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