Scope 3 emissions
Scope 3 emissions are the greenhouse gas emissions that occur across a company's value chain rather than from its own operations (Scope 1) or purchased energy (Scope 2). The GHG Protocol defines 15 Scope 3 categories; for manufacturers, category 1, purchased goods and services, is usually the largest by far. That puts the biggest decarbonization lever in procurement's hands, since these emissions sit inside supplier processes and sourcing choices.
Examples
Finding the lever: A robotics manufacturer's inventory totals 80,000 tCO2e: 5,000 from its own operations and purchased energy, 58,000 from purchased goods, and the rest across other Scope 3 categories. Machined aluminum alone contributes 19,000 tonnes; shifting two part families to high-recycled-content billet cuts roughly 8,000 tonnes, more than Scopes 1 and 2 combined.
Survey reality: A buyer surveys 300 suppliers for emissions data. Ninety respond, and 12 provide product-level numbers. The team estimates the rest with activity-based factors and concentrates primary-data requests on the 25 suppliers that represent half of spend.
Definition
The GHG Protocol splits Scope 3 into 15 categories spanning upstream activities (purchased goods, inbound freight, business travel) and downstream ones (distribution, product use, end of life). For most hardware companies two categories dwarf the rest: purchased goods and services, and use of sold products when the product consumes energy. Every casting, PCB, and fastener arrives carrying embedded emissions from supplier processes.
That is why ownership lands on procurement. The emissions sit inside supplier factories, so reducing them means changing what you buy (material substitutions, recycled content), whom you buy from (supplier energy mix), and how goods move (ocean versus air). Data collection is the hard part: supplier surveys get weak response rates, boundaries differ from one reply to the next, and product-level carbon footprints remain rare. Practical programs rank categories by spend and mass, write emissions expectations into the supplier code of conduct, and weight them in awards as part of sustainable procurement.
Estimation follows the same data-quality ladder as the rest of carbon accounting, and AI is starting to ease the collection burden, a topic covered in how AI supports sustainability in supply chains. LightSource, an AI-native procurement platform for direct materials, structures the line-item spend and supplier data that Scope 3 estimates are built on.
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