The difficult emissions are outside the fence
Many companies can start by measuring electricity, fuel and owned operations. The harder work begins with Scope 3 emissions, which sit across suppliers, transport, products, customers, waste and other parts of the value chain.
This is where sustainability reporting becomes a supply chain management test.
Supplier data will be uneven
Large suppliers may have sustainability teams and emissions data. Smaller suppliers may not. Some will rely on estimates. Others will not understand the request. Companies will need practical collection methods that improve over time without paralysing procurement.
The first year will rarely be perfect. But it must be documented, transparent and improving.
Procurement needs a new role
Procurement teams will increasingly need to assess suppliers on more than price and delivery. Environmental performance, labour practices, safety, governance and data readiness will shape supplier risk.
This does not mean excluding smaller suppliers automatically. It means helping strategic suppliers build capability while setting minimum standards.
Estimates must be defensible
Scope 3 reporting often requires estimation. That is acceptable when methodology, assumptions and limitations are clear. It becomes risky when companies present weak estimates as precise facts.
Assurance providers will look for logic, consistency and evidence. A number without a method is not a disclosure; it is a liability.
What to fix first
Map the value chain. Identify high-emission categories. Segment suppliers. Start with the biggest risk areas and build data requests into procurement systems. Scope 3 is not a one-month exercise.
