What is carbon accounting, and who needs it?
Carbon accounting is the measurement of an organisation's greenhouse gas emissions, expressed in tonnes of CO2 equivalent and reported under a recognised method, usually the GHG Protocol. It turns energy bills, fuel logs, purchases and travel into one auditable number per scope, the figure customers, banks and regulators now ask for.
Carbon accounting, defined.
All greenhouse gases, converted into CO2 equivalent (CO2e), split into Scope 1 (direct), Scope 2 (purchased energy) and Scope 3 (value chain).
Activity data multiplied by emission factors: litres of diesel, kilowatt-hours, tonnes of steel, each with a factor in kg CO2e per unit.
A greenhouse gas inventory: the yearly footprint, broken down by scope, site and source, with methods and factors documented.
Why companies do it in 2026.
Customers ask. Large companies in the EU and the US must report their value chain. Their Scope 3 includes your Scope 1 and 2, so supplier questionnaires and data requests now reach mid-size firms with no reporting duty of their own. In the US, California's SB 253 reaches companies with over USD 1 billion in revenue, and scope 3 reporting under it begins in 2027.
Carbon is priced at the border. Since 1 January 2026 the EU's CBAM puts a price on the embedded emissions of imported cement, iron and steel, aluminium, fertilisers, electricity and hydrogen. Importers must declare those emissions, and their suppliers abroad are asked for installation-level data.
Banks and reporting rules. Lenders collect ESG data from business clients, and the EU's voluntary VSME standard asks for Scope 1 and 2. Companies inside the post-Omnibus CSRD scope report climate data under ESRS E1.
Five steps to a carbon inventory.
The frameworks behind the numbers.
| Standard | What it is | Typical use |
|---|---|---|
| GHG Protocol Corporate Standard | Accounting framework from WRI and WBCSD defining Scopes 1, 2 and 3 | Referenced by ESRS E1, SB 253, CDP and most customer requests |
| GHG Protocol Scope 3 Standard | Rules for the 15 value-chain categories | Supplier and product footprints |
| ISO 14064-1 | International standard for organisation-level GHG inventories | When a certifiable, verifiable inventory is required |
| ISO 14064-3 | Specification for validating and verifying GHG statements | Third-party verification |
How the two main standards compare: GHG Protocol vs ISO 14064.
Accounting, footprint, offsetting.
Carbon accounting vs carbon footprint. The footprint is the result; carbon accounting is the method and the records that produce it. A footprint without documented accounting behind it is an estimate.
Carbon accounting vs offsetting. Accounting measures emissions. Offsetting buys credits for reductions elsewhere. The GHG Protocol inventory reports gross emissions; credits do not reduce Scopes 1, 2 or 3.
Software vs consultant. Software stores data and runs calculations; someone still has to set the boundary, choose factors and defend the method. Habitat does both: the consulting here, the platform at karbon360.tech.
An emissions number you cannot document is an estimate, not an inventory.
Frequently asked.
What is carbon accounting in simple terms?
What is the difference between carbon accounting and a carbon footprint?
Which standard is used for carbon accounting?
Do small companies need carbon accounting?
How long does a first carbon inventory take?
Get a footprint you can defend.
Habitat builds GHG Protocol inventories with the boundary, factors and method written down. Fixed-fee quote within 48 hours.