Scope 3 Emissions
Scope 3 emissions are all indirect greenhouse gas emissions that occur in an organization's value chain — both upstream (suppliers, purchased goods, business travel, employee commuting) and downstream (product use, end-of-life treatment, investments). Scope 3 typically represents 70–90% of a company's total carbon footprint.
The GHG Protocol defines 15 categories of Scope 3 emissions divided into upstream (Categories 1–8) and downstream (Categories 9–15). Major upstream categories include purchased goods and services (Category 1), capital goods (Category 2), fuel- and energy-related activities not in Scope 1 or 2 (Category 3), transportation and distribution (Category 4), waste (Category 5), business travel (Category 6), and employee commuting (Category 7).
Major downstream categories include transportation and distribution (Category 9), processing of sold products (Category 10), use of sold products (Category 11), end-of-life treatment (Category 12), and investments (Category 15, critical for financial institutions).
Measurement approaches range from spend-based estimates (using economic input-output factors) to activity-based calculations (using supplier-specific data) to hybrid methods. Activity-based data is more accurate but harder to collect, requiring supplier engagement programs.
Gravity's supply chain module automates data requests to suppliers, enriches responses with AI, and tracks data quality so organizations can systematically improve Scope 3 accuracy over time. This iterative approach — starting with spend-based estimates and progressively replacing them with primary data — is the recommended path by both the GHG Protocol and SBTi.
Frequently asked questions
What are Scope 3 emissions? +
Scope 3 emissions are indirect greenhouse gas emissions across an organization's entire value chain, covering 15 categories from purchased goods and services to end-of-life treatment of sold products. They typically represent 70–90% of a company's total carbon footprint.
What are the 15 categories of Scope 3? +
Upstream: (1) Purchased goods/services, (2) Capital goods, (3) Fuel/energy-related activities, (4) Upstream transport, (5) Waste, (6) Business travel, (7) Employee commuting, (8) Upstream leased assets. Downstream: (9) Downstream transport, (10) Processing of sold products, (11) Use of sold products, (12) End-of-life, (13) Downstream leased assets, (14) Franchises, (15) Investments.
How do you measure Scope 3 emissions? +
Organizations typically start with spend-based estimates using economic input-output factors, then progressively improve accuracy by collecting activity-based data from suppliers. Hybrid approaches combine both methods. Platforms like Gravity automate supplier data requests and track data quality improvements over time.
Why is Scope 3 the hardest scope to measure? +
Scope 3 is difficult because emissions occur outside the organization's direct control, requiring data from hundreds or thousands of suppliers. Data availability, quality, and standardization vary widely, and many categories require estimation methods rather than direct measurement.
Related terms
Scope 1 Emissions
Scope 1 emissions are direct greenhouse gas emissions from sources that an organization owns or controls. This includes combustion of fossil fuels in owned boilers, furnaces, and vehicles; process emissions from manufacturing; and fugitive emissions such as refrigerant leaks and methane from owned landfills.
Scope 2 Emissions
Scope 2 emissions are indirect greenhouse gas emissions from the generation of purchased electricity, steam, heating, and cooling consumed by an organization. They are called 'indirect' because the emissions physically occur at the power plant or utility, not at the reporting company's facilities.
Supply Chain Emissions
Supply chain emissions are the greenhouse gases produced throughout an organization's upstream and downstream value chain — from raw material extraction and manufacturing through distribution, product use, and end-of-life disposal. In GHG Protocol terms, these are Scope 3 emissions, and they typically represent the majority of a company's total footprint.
Spend-Based Method
The spend-based method estimates greenhouse gas emissions by multiplying procurement expenditure (in dollars or other currency) by economic emission factors that represent the average emissions intensity per unit of spend in a given sector. It is the most accessible Scope 3 estimation approach but also the least precise.
Product Carbon Footprint (PCF)
A product carbon footprint (PCF) quantifies the total greenhouse gas emissions associated with a product throughout its lifecycle — from raw material extraction (cradle) through manufacturing, distribution, use, and end-of-life disposal (grave). It is expressed in units of CO₂e per functional unit of the product.
GHG Protocol
The GHG Protocol is the world's most widely used greenhouse gas accounting standard. Developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), it provides frameworks for organizations, cities, and countries to measure and manage their emissions across three scopes.