Emission factor datasets and updates

Selection of datasets integrated in Carbon+Alt+Delete

At Carbon+Alt+Delete, we value transparency, precision, and reliability in carbon accounting by utilizing datasets from trusted and official sources in our emission factor model. In order to achieve this, we provide a selection of integrated datasets, that satisfy our internal criteria of completeness, consistency, recent and relevant. We draw our data from respected databases such as the UK Government's BEIS, Ecoinvent, ADEME, IEA, and AIB, among others.

Why We Update Emission Factors

Accurate carbon accounting depends on consistent and current data. To maintain methodological integrity, we follow a constant base year recalculation policy (as defined by the Greenhouse Gas Protocol), with a recalculation threshold of 0.001%. This means:

• Your inventories are automatically recalculated when improved or corrected emission factors become available—even for past years.

• All projects from the same reporting year will reflect the same state of knowledge, even if those projects were created at different times.

These updates allow us to correct past inaccuracies and improve data precision over time.

How to make use of the latest emission factors

Any emission factor used from an integrated source on Carbon+Alt+Delete (not a custom emission factor), will be updated whenever more recent information is made available on the platform. Even if that source is not yet available when the information is logged.

For example, a UK.Gov emission factor with reporting date 05/04/2025 will draw its emission factor from the 2025 version of the UK.Gov GHG emission factors, even if that document was not available yet at the time of entry. In the in-between time, the most appropriate available factor will be used (in this case from the 2024 UK.Gov publication).

Note that this is different from Life Cycle Assessment (LCA) databases, like Ecoinvent, which have an inherent versioning system in their publication methods. For these, the initial version choice will remain unchanged even if other versions are added to the platform later.