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.
For most companies, supply chain emissions dwarf direct operations. A consumer goods manufacturer may find that 80–90% of its footprint comes from purchased materials, packaging, and logistics. A financial institution's financed emissions (Scope 3 Category 15) often exceed its operational emissions by 100x or more.
Measuring supply chain emissions requires data from external parties. Three approaches exist: spend-based estimation (using economic input-output factors applied to procurement spend), average-data methods (using industry-average emission factors per unit of activity), and supplier-specific data (using primary data collected directly from suppliers through engagement programs).
Each approach trades accuracy for feasibility. Spend-based is the easiest to implement but least accurate. Supplier-specific data is the most accurate but requires active engagement with hundreds or thousands of suppliers.
The best practice is a hybrid approach: start with spend-based estimates for full coverage, then progressively improve accuracy by collecting primary data from the highest-emitting suppliers. Gravity's supply chain module automates this progression with supplier data request workflows, AI-assisted data enrichment, and data quality tracking that shows improvement over time.
Frequently asked questions
What are supply chain emissions? +
Supply chain emissions are all greenhouse gases produced across an organization's value chain — from raw materials through product use and disposal. Classified as Scope 3 under the GHG Protocol, they typically represent 70–90% of a company's total carbon footprint.
How do you collect supply chain emissions data? +
Three approaches: spend-based estimation (easiest but least accurate), average-data methods (industry-average factors per activity unit), and supplier-specific primary data (most accurate, requires engagement programs). Best practice is a hybrid approach, progressively improving from spend-based to primary data.
Related terms
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.
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.
Carbon Accounting
Carbon accounting is the systematic process of measuring, recording, and reporting the greenhouse gas (GHG) emissions produced by an organization, product, or activity. It follows standardized methodologies — most commonly the GHG Protocol — to quantify emissions across Scope 1 (direct), Scope 2 (purchased energy), and Scope 3 (value chain) categories, producing an auditable inventory that underpins disclosure, reduction planning, and regulatory compliance.