# What should a one-page methodology note sent to buyers include?

Canonical: https://senseible.earth/answers/carbon-methodology-note-for-buyers

The boundary, the period, the scopes covered, the data sources, the factors and their versions, and what was estimated. One page is enough. It lets a buyer understand your figure without a call, and it keeps your answers the same from one buyer to the next.

## Sections

1. Company, sites and control approach.
2. Reporting period.
3. Scopes and Scope 3 categories included.
4. Data sources: bills, invoices, meters.
5. Emission factors with source and version.
6. Estimates and how they were made.
7. Changes since last year.

## Keep it current

Update it each year and date it, so a buyer knows which version applies.

## What Senseible does here

Senseible keeps every bill, invoice and calculation in one dated, fingerprinted record, so the evidence behind each figure can be found again by anyone who checks it.

- [ISO 14064-1 report contents](https://senseible.earth/answers/what-goes-in-an-iso-14064-1-ghg-report)
- [Share emissions without invoices](https://senseible.earth/answers/share-emissions-with-buyer-without-invoices)
- [AR5 vs AR6 GWP](https://senseible.earth/answers/ar5-vs-ar6-gwp-which-to-use)

Sources: [GHG Protocol Corporate Standard](https://ghgprotocol.org/corporate-standard), [GHG Protocol Corporate Value Chain (Scope 3) Standard](https://ghgprotocol.org/corporate-value-chain-scope-3-standard)

Last reviewed 2026-10-23.