Why Scope 3 emissions matter
Scope 3 is where the real footprint lives, and where it is hardest to control, because most of it sits with suppliers and customers rather than inside the company's own walls. A manufacturer can decarbonise its factory and barely move its total footprint if the bulk of emissions are embedded in purchased cathode material or steel.
That is also why Scope 3 has become a procurement issue, not just a reporting one. When a large company commits to cutting its Scope 3, it starts asking its suppliers for product-level emissions data, and suppliers who can't provide it risk being de-selected. One company's Scope 3 is another company's product carbon footprint.
The 15 categories of Scope 3
The GHG Protocol divides Scope 3 into 15 categories, eight upstream and seven downstream. Upstream categories include purchased goods and services, capital goods, fuel- and energy-related activities, upstream transport, waste, business travel, employee commuting, and upstream leased assets. Downstream categories include downstream transport, processing of sold products, use of sold products, end-of-life treatment, downstream leased assets, franchises, and investments. For most product manufacturers, "purchased goods and services" dominates the total.
How Scope 3 emissions are measured
There are two broad approaches. A spend-based method multiplies financial spend by generic emission factors. An activity-based method uses physical data and product-specific footprints. The spend-based method is quick but crude; the activity-based method, built on supplier product carbon footprints and LCA data, is far more accurate and is what credible, customer-facing reporting increasingly demands. The shift from spend-based estimates to primary, product-level data is the central challenge in Scope 3 today.
Scope 3 and life cycle assessment
A supplier's product carbon footprint, an LCA output, is the building block of a buyer's Scope 3 inventory. The more suppliers can provide rigorous, primary-data PCFs, the more accurate the whole chain's Scope 3 becomes. This is why LCA capability upstream and Scope 3 reporting downstream are two ends of the same problem: credible value-chain emissions data.
Accurate Scope 3 starts with primary, product-level footprints from your suppliers. See how Minviro builds supplier-grade product footprints →
Why Scope 3 emissions matter
Scope 3 is where the real footprint lives, and where it is hardest to control, because most of it sits with suppliers and customers rather than inside the company's own walls. A manufacturer can decarbonise its factory and barely move its total footprint if the bulk of emissions are embedded in purchased cathode material or steel.
That is also why Scope 3 has become a procurement issue, not just a reporting one. When a large company commits to cutting its Scope 3, it starts asking its suppliers for product-level emissions data, and suppliers who can't provide it risk being de-selected. One company's Scope 3 is another company's product carbon footprint.
The 15 categories of Scope 3
The GHG Protocol divides Scope 3 into 15 categories, eight upstream and seven downstream. Upstream categories include purchased goods and services, capital goods, fuel- and energy-related activities, upstream transport, waste, business travel, employee commuting, and upstream leased assets. Downstream categories include downstream transport, processing of sold products, use of sold products, end-of-life treatment, downstream leased assets, franchises, and investments. For most product manufacturers, "purchased goods and services" dominates the total.
How Scope 3 emissions are measured
There are two broad approaches. A spend-based method multiplies financial spend by generic emission factors. An activity-based method uses physical data and product-specific footprints. The spend-based method is quick but crude; the activity-based method, built on supplier product carbon footprints and LCA data, is far more accurate and is what credible, customer-facing reporting increasingly demands. The shift from spend-based estimates to primary, product-level data is the central challenge in Scope 3 today.
Scope 3 and life cycle assessment
A supplier's product carbon footprint, an LCA output, is the building block of a buyer's Scope 3 inventory. The more suppliers can provide rigorous, primary-data PCFs, the more accurate the whole chain's Scope 3 becomes. This is why LCA capability upstream and Scope 3 reporting downstream are two ends of the same problem: credible value-chain emissions data.
Accurate Scope 3 starts with primary, product-level footprints from your suppliers. See how Minviro builds supplier-grade product footprints →
Why Scope 3 emissions matter
Scope 3 is where the real footprint lives, and where it is hardest to control, because most of it sits with suppliers and customers rather than inside the company's own walls. A manufacturer can decarbonise its factory and barely move its total footprint if the bulk of emissions are embedded in purchased cathode material or steel.
That is also why Scope 3 has become a procurement issue, not just a reporting one. When a large company commits to cutting its Scope 3, it starts asking its suppliers for product-level emissions data, and suppliers who can't provide it risk being de-selected. One company's Scope 3 is another company's product carbon footprint.
The 15 categories of Scope 3
The GHG Protocol divides Scope 3 into 15 categories, eight upstream and seven downstream. Upstream categories include purchased goods and services, capital goods, fuel- and energy-related activities, upstream transport, waste, business travel, employee commuting, and upstream leased assets. Downstream categories include downstream transport, processing of sold products, use of sold products, end-of-life treatment, downstream leased assets, franchises, and investments. For most product manufacturers, "purchased goods and services" dominates the total.
How Scope 3 emissions are measured
There are two broad approaches. A spend-based method multiplies financial spend by generic emission factors. An activity-based method uses physical data and product-specific footprints. The spend-based method is quick but crude; the activity-based method, built on supplier product carbon footprints and LCA data, is far more accurate and is what credible, customer-facing reporting increasingly demands. The shift from spend-based estimates to primary, product-level data is the central challenge in Scope 3 today.
Scope 3 and life cycle assessment
A supplier's product carbon footprint, an LCA output, is the building block of a buyer's Scope 3 inventory. The more suppliers can provide rigorous, primary-data PCFs, the more accurate the whole chain's Scope 3 becomes. This is why LCA capability upstream and Scope 3 reporting downstream are two ends of the same problem: credible value-chain emissions data.
Accurate Scope 3 starts with primary, product-level footprints from your suppliers. See how Minviro builds supplier-grade product footprints →