Supplier Carbon Footprint

A supplier carbon footprint quantifies the greenhouse gas (GHG) emissions associated with a supplier's operations and outputs, expressed in tonnes of CO2 equivalent (tCO2e). It typically covers the supplier's Scope 1 (direct emissions), Scope 2 (purchased electricity), and increasingly Scope 3 (upstream value chain) emissions, allocated to the products or services delivered to a given buyer.

How it is measured

Two main approaches exist. Spend-based methods multiply supplier spend by an emissions factor for the industry; activity-based methods use actual data such as kWh consumed, kilometers shipped, or kilograms of material used. Activity-based data is more accurate but harder to collect.

• Request supplier-specific emissions data through annual disclosures or CDP

• Apply emissions factors from databases such as ecoinvent or GHG Protocol

• Allocate emissions to delivered products using mass, value, or physical units

• Validate against third-party assurance where available

Why it matters in procurement

For most large enterprises, Scope 3 emissions, dominated by purchased goods and services, account for 70 to 90 percent of the total carbon footprint. Supplier-level data is therefore the foundation of credible climate reporting and decarbonization plans. Procurement is the function with the relationship and contractual leverage to collect this data, factor it into sourcing decisions, and incentivize supplier reductions through preferred-supplier status or contractual targets.