ESG beyond the report: how emission targets become supply chain restrictions

The vast majority of medium-sized Brazilian companies treat ESG as a communication function — they produce an annual report, list the year's initiatives, photograph the solar panel at headquarters and call it sustainability. This model worked when buyers did not ask for verifiable data and when the market had no mechanism for distinguishing real commitment from a declaration of intent. This period is ending. Not because Brazilian regulators started to demand it — but because corporate clients with decarbonization goals started to. And losing a relevant customer for not having a carbon tracking system is a different type of pressure than being fined.

What are Scope 3 emissions and why they matter now

The GHG Protocol — the most adopted carbon accounting framework globally — divides emissions into three scopes. Scope 1 are direct emissions from the operation itself: fuel burned in its own factories and fleets. Scope 2 are the emissions from purchased electrical energy. Scope 3 are all other emissions in the value chain: those that come from suppliers, raw materials, third-party transport, the use of products by customers and disposal at the end of their useful life.

For most companies with intensive operations, Scope 3 represents between 70% and 90% of total emissions. An automaker may have relatively small Scope 1 and 2 and a huge Scope 3 — every piece of metal, plastic and electronics that enters the chain has associated emissions. A retail company has emissions from suppliers who manufacture the products, from outsourced transportation, and from home use of the items sold. Ignoring Scope 3 is measuring less than 30% of the problem.

What has changed recently is that companies with net-zero goals — especially those with public commitments for 2030 or 2040 — have realized that it is not possible to achieve these goals without addressing Scope 3. And addressing Scope 3 means engaging the supply chain, asking for emissions data and, progressively, using this data as criteria for selecting and maintaining suppliers.

How ESG becomes a B2B requirement in practice

The mechanism is straightforward: a multinational with a net-zero target for 2030 sends a sustainability questionnaire to all its suppliers. The questionnaire requests Scope 1, 2 and — when the supplier has its own relevant chain — Scope 3 downstream emissions data. Suppliers that do not have the data lose points in the qualification assessment. Suppliers that have the data but show carbon intensity well above their peers are candidates for replacement or time-bound improvement plans.

This process is already happening in Brazil. Auto parts companies that supply European carmakers are receiving carbon questionnaires as a condition of contract renewal. Suppliers of agricultural commodities selling to global processors need to demonstrate traceability of origin to comply with European deforestation guidelines (EUDR). Logistics companies that provide services to exporters of manufactured goods need to report transportation emissions for customers' Scope 3 reports.

The scaling of this requirement follows the logic of supply chains: when a large company starts to order, its direct suppliers start to order from their own suppliers to consolidate the data. The requirement goes down the chain, eventually reaching companies that have never had any contact with the sustainability agenda because they sell exclusively to the domestic market or to smaller companies.

What suppliers need to prepare

The first element is carbon accounting — a system that measures, calculates and documents an operation's emissions in a methodologically consistent manner with the GHG Protocol. This is not a report that a consultant produces once a year. It is a system that collects operational data — energy consumption, fuel, raw materials, transport — and converts it into tons of CO₂ equivalent using validated emission factors.

The difference between having an emissions number and having a verifiable number is the difference that matters for contracts. Customers demanding carbon data want to know that the data is auditable — whether an external auditor could verify that the reported number matches operational reality. This requires documentation of the calculation methodology, traceability of data sources and, progressively, certification by auditors with recognized credentials (such as ISO 14064 standards or verifications aligned to the GHG Protocol).

The second element is industry certifications relevant to the supplier's industry. Depending on the sector and customer, certifications such as ISCC (for biomass and sustainable fuels), FSC (for paper and wood), RBA (for electronics supply chain) or alignment with Science Based Targets — public commitment to reduce emissions based on climate science, validated by third parties — may be required.

The data infrastructure that underpins carbon compliance

Carbon accounting at scale is not a sustainability project — it's a data project. It requires integration with energy management systems, transportation and logistics systems, purchasing systems to track raw materials, and production systems to correlate output with resource consumption.

Carbon management software platforms — Watershed, Persefoni, Sweep, Plan A, among others — have emerged as a specific category in the last four years precisely because Excel is not sufficient for the level of granularity and verifiability that corporate customers have come to demand. Companies that invest in this data infrastructure early are able to respond to supplier questionnaires accurately, compare their performance with sector benchmarks and identify which parts of the operation have the greatest impact and greatest potential for reduction.

Companies that do not have this infrastructure often respond to questionnaires with estimates based on average sector data — which is methodologically valid but less precise and less reliable than real data from the operation itself. As customer demand standards increase, the difference between actual data and industry estimates will become the difference between keeping the contract and not keeping it.

What to do in the next twelve months

Companies that do not yet have a carbon accounting system should start with the Scope 1 and 2 inventory, which is simpler to measure (energy sources from the operation itself) and is the prerequisite for any Scope 3 analysis. This initial inventory, carried out using the GHG Protocol methodology, already allows you to answer most of today's supplier questionnaires.