Understanding CO₂e requests — Case #1
Supplier carbon attestation: what is actually requested
In most situations, a “supplier carbon attestation” is not a legal obligation and not an audit. It is an operational request from procurement teams: obtain a simple, consistent and reusable CO₂e indicator for ESG screening, supplier onboarding and tenders.
1. Why buyers request a supplier CO₂e attestation
Organizations facing transparency obligations (or market expectations) need environmental information across their value chain. In practice, this becomes supplier questionnaires, responsible procurement criteria, and simple “proof” documents to support internal files.
What the buyer wants (very concretely)
- a CO₂e indicator available quickly
- a documentable and shareable format (standard PDF)
- an explicit method (even if indicative) and stable
- a document reusable across multiple requests
- minimum traceability (ID, date, version)
2. When it is acceptable (and when it is not)
A supplier CO₂e attestation is generally acceptable when used for screening, onboarding or internal comparison (procurement decision). It is not acceptable when used as a substitute for regulatory reporting or certification.
Acceptable (most common)
- supplier ESG / CSR questionnaires
- pre-qualification before contracting
- tender (informative “carbon” criterion)
- internal responsible procurement reporting
- request for “a CO₂e indicator, even estimated”
Not acceptable (must be scoped or refused)
- request for audit, certification, or external assurance
- explicit “ISO 14064-1” / audited footprint requirement
- official CSRD / ESRS reporting
- marketing claims implying compliance
- full, verified Scopes 1–2 (and beyond)
If a contracting party requires an audit or a specific standard, the right move is to clarify the expected scope (screening vs audited reporting) before producing any document.
3. What your customer expects as “proof” (format and content)
Buyers prefer a document that looks like operational evidence: dated, identifiable, methodologically explicit, and easy to archive. The value is not maximum scientific precision; it is consistency and reusability.
Minimal checklist (screening-ready document)
- organization name (simple identification)
- coverage year and issue date
- aggregated CO₂e result (tCO₂e)
- declared method (e.g., spend-based)
- factor set / factor version
- unique ID + verification link/QR
- visible clauses: indicative, not audited, not CSRD/ESRS
A document with these elements typically satisfies procurement screening and internal file requirements, without claiming certification.
4. How to respond safely (wording and scoping)
Legal safety and credibility rely on one thing: state clearly what the document is and what it is not. The goal is to avoid third parties interpreting the attestation as an audit or regulatory compliance.
Recommended wording
- Use: “indicative CO₂e attestation”, “spend-based estimate”, “ESG screening document”, “procurement / onboarding use”.
- Avoid: “certified”, “CSRD/ESRS compliant”, “carbon audit”, “regulatory carbon inventory”.
To scope an over-ambitious request (audit, compliance), the most effective answer is: “We can provide a standardized, indicative estimate for procurement screening. If you require an audit or a specific standard, please specify the expected framework and scope.”
5. Why a standardized (and verifiable) document actually helps
The problem with supplier CO₂e requests is not missing data. It is the lack of a simple, stable, reusable format. Standardization reduces:
- time spent answering each questionnaire
- misunderstandings about scope and method
- back-and-forth with procurement teams
- risk of “audit / compliance” misinterpretation
6. Frequently asked questions (procurement & suppliers)
Can a buyer require an audited carbon footprint?
Yes, contractually a buyer can impose requirements. In practice, most requests target a simple indicator for screening, especially early in the process. If an audited requirement is stated, ask for the exact standard and scope.
Does “carbon attestation” mean “CSRD/ESRS”?
No. CSRD/ESRS applies to companies under the reporting obligation. Supplier requests are most often value-chain data collection. An indicative attestation is relevant only as an informational document (screening), not as regulatory reporting.
What if they ask for “Scope 1 / 2 / 3”?
Clarify whether the buyer wants an indicative screening indicator or audited publication. If the request is for screening, provide a standardized document stating method and limitations. If a full inventory is required, an indicative attestation is not the right tool.
Respond fast, without ambiguity, with a standard document
If a customer asks for a “supplier carbon attestation”, the goal is usually a procurement screening indicator. Certif-Scope produces an indicative, structured, traceable and verifiable attestation.