Methodology changelog

Every published version of the CarbonKick methodology, newest at the top.

Version 2.0, October 4, 2026

Current version: /methodology

Added: AI reads, code calculates. The AI model extracts activity data; fixed, tested code computes every number.
Added: factor selection rules (closest region, most specific, most recent edition), with source and edition year on every line.
Added: same bill, same result, with versioned factor corrections.
Added: extraction checks. Lines are reconciled against bill totals; delivery and transportation charge lines are excluded from totals and kept visible.
Added: no sourced factor, no number.
Added: spend-based estimate rules, including the share of the footprint that is spend-based.
Clarified: Scope 2 is location-based, using EPA eGRID subregions for US sites. Market-based inputs are recorded and disclosed, not calculated.
Added: missing months are listed and never filled silently. Extrapolation is labeled and user-chosen.
Added: corrections keep the original extracted value.
Added: a table of what AI does and does not do.
Rewritten: the consistency section.
Removed: an unsourced characterization of the DESNZ/DEFRA dataset.

Initial published version.