Value-chain emissions data is scattered across procurement, logistics, and sustainability systems. Connecting it is as much an IT challenge as a sustainability one.
Scope 3 emissions are often the largest share of a company’s carbon footprint, and they are almost always the hardest to calculate. Much of that difficulty comes from how and where the data is collected and stored.
Purchase orders and supplier master records sit in the enterprise resource planning (ERP) system. Freight data may come from a transportation management system or a stack of carrier invoices. Supplier-reported emissions arrive by email, spreadsheet, or portal. The sustainability team then assembles all of it in a separate tool. When each function works from its own source, the problems compound. The same supplier can appear under three different names, and the same purchase can be counted twice or missed entirely.
That is why Scope 3 data has become an enterprise data challenge as well as a carbon accounting exercise.
Why the Data Is So Hard to Manage
Visibility thins out quickly as companies look further down the value chain. PwC’s “2026 State of Decarbonization” report analyzed 158 Fortune 500 companies. It found that 25% had no visibility beyond tier 1 suppliers and 58% had only partial visibility into tier 2. Just 18% consistently tracked supplier activities and emissions beyond tier 1.
Every gap gets filled with something, usually an estimate. The resulting inventory blends supplier-provided figures, activity-based calculations, and spend-based approximations. If those inputs are scattered across disconnected systems, no one can say with confidence how the final number was built.
Connect Emissions Data to the Systems That Already Run the Business
Much of the information needed for Scope 3 already exists in enterprise systems. Sustainability data is also starting to move into core workflows. The EcoVadis and Accenture “Sustainable Procurement Barometer 2026” found that 98% of surveyed companies have begun embedding environmental, social, and governance (ESG) data into procurement processes, though full digital integration is still a work in progress.
Consider an industrial equipment manufacturer that buys steel, castings, and electronic components. If its emissions calculations draw only on annual spend totals, the result is a rough, category-level estimate. By connecting those calculations to material masters, purchase-order quantities, supplier IDs, and freight records, the company gains a more detailed view of its emissions. It can move from spend-based to activity-based methods where the data supports it and analyze emissions by supplier, plant, or product line, the same way it analyzes cost.
Emissions information becomes far more useful when it shares keys and structures with the purchasing, supplier, and logistics data the business already trusts.
Traceability Is What Makes the Number Credible
IT teams understand data lineage. Scope 3 needs the same discipline. Knowing the provenance behind each figure is what separates a defensible inventory from a number no one wants to sign off on.
In practice, that means tagging every data point with its source type: supplier-specific primary data, activity data, a spend-based estimate, or an industry average. It also means recording which emission factors were applied, and which version, along with the date. With that metadata in place, reviewers can see how much of the inventory rests on solid ground. They can trace any figure back to its origin, much as they would with financial data, and spot which inputs carry the most uncertainty.
Treat Estimates as Governed Data
Estimates will remain part of Scope 3 reporting for the foreseeable future. The goal is to manage them as deliberately as any other enterprise data.
That starts with documented methodologies and a controlled emission factor library. Approvals should be required before a calculation method changes. Estimates should also carry flags that signal when they are due for replacement. Without those controls, two analysts can apply different factors to the same purchase category, and nobody notices until the totals stop reconciling.
Method choices matter more than they might seem. Spend-based estimates are tied to price, so a premium, lower-carbon grade of steel can appear more emissions-intensive than a cheaper, higher-carbon alternative. That makes spend-based figures useful for spotting emissions hotspots and risky for supplier-level decisions. Clear documentation helps teams understand these limitations before using the data to make decisions.
Decide Where Better Supplier Data Is Worth the Effort
Collecting primary data from every supplier is neither realistic nor necessary. The effort pays off where a category drives a large share of emissions, where a sourcing or contract decision is coming up, and where current estimates are especially uncertain. For a long tail of low-impact purchases, a well-documented estimate is often the right answer.
Making that call requires the connected view described above. A team can’t prioritize what it can’t see.
Shared Ownership Makes Scope 3 Data Reliable
IT and enterprise technology teams are well placed to make Scope 3 data reliable. They can integrate ERP, procurement, and logistics sources, apply master data management practices to consistently identify suppliers and materials, establish access controls and audit trails, and make emissions information available to the people who need it.
Clear ownership matters just as much as integration. Sustainability teams typically define methodologies. Procurement owns supplier relationships and data requests. Finance often reviews controls. IT manages the data pipelines and quality rules that support the process. When those roles are explicit, gaps and methodology changes don’t get lost between reporting cycles.
The benefits extend well beyond reporting. Reliable, traceable Scope 3 data helps companies prepare for assurance, allows procurement teams to weigh carbon alongside cost and risk, and gives operations and planning teams a clearer view of where emissions and business priorities intersect.
Scope 3 will never be built entirely on perfect information. With connected systems, strong governance, and clear lineage, it can be built on information the enterprise understands and trusts. That is a goal business and IT leaders are well equipped to deliver together.
