Practical Carbon Data Guides
Clear, source-based guidance for companies responding to carbon requests, collecting emissions data, and making Scope 3 decisions.
If you know what your customer or reporting program needs but are unsure whether your data is ready, use our free Carbon Data Readiness Assessment to identify gaps before choosing tools or software.
New to supplier requests? Start with Customer Asked for Carbon Emissions Data? Start Here. If you are evaluating platforms for a larger program, see 10 enterprise carbon accounting software capabilities and the carbon accounting software comparison framework.
Start with the problem in front of you
GETTING STARTED
Customer Asked for Carbon Emissions Data? Start Here
Understand what the customer is asking for, what data you need, and what to clarify before calculating anything.
SUPPLIER RESPONSE
How to Answer a Supplier Carbon Questionnaire
Map the questionnaire, assign data owners, handle gaps and document methods before submitting your response.
2026 UPDATE
What Carbon Data Can Customers Ask Suppliers For?
From Scope 1–3 and product footprints to evidence and assurance — including the 2026 EU value-chain cap.
What Carbon Data Can Customers Ask Suppliers For? — Read the guide →
OBLIGATION VS REQUEST
Do You Have to Provide Carbon Data to Your Customers?
Understand the difference between customer requests, contract requirements and regulated value-chain reporting limits.
FOUNDATIONS
Scope 1, 2 and 3 Emissions: Examples and Differences
Understand the three scopes with practical examples and the source data each one usually requires.
CALCULATION METHODS
Spend-Based vs Activity-Based vs Supplier-Specific
Compare the data requirements, strengths and limitations of the main Scope 3 calculation approaches.
SCOPE 3 REPORTING
Scope 3 Emissions Reporting: A Practical 2026 Guide
Build a repeatable workflow from category screening and supplier data through calculation, evidence and reported output.
Have the customer’s wording in front of you?
Use the Carbon Request Decoder before reading the longer guides. It turns the request into a structured checklist and clarification questions.