The Cornerstone EEIO model is a multi-regional environmentally-extended input-output model. It links countries’ economies through international trade and attaches greenhouse gas emissions to every sector. Cornerstone EEIO is the successor of the USEEIO and CEDA models; see Origins of the Cornerstone EEIO.
Cornerstone EEIO 2026 was developed to produce cradle-to-gate emission factors for the goods and services that organizations commonly buy. These emission factors are the primary data product of the 2026 release: spend-based factors, in kg CO₂e per USD, for 405 sectors across 148 countries, 21 regional averages and one global average. They are most commonly used for Scope 3 measurements in corporate inventories and for academic and policy research.
The 2026-rc.1 release publishes the spend-based GHG emission factors. The full 2026-v1 release adds a 2017–2026 time series and will be accompanied by the model matrices, in a format still to be decided.
New to EEIO? Start with a short, visual primer on how EEIO models work and where Cornerstone EEIO comes from.
Technical documentation¶
How the model is built, how the emission factors are calculated from it, and how both are checked.
How country tables are linked through trade into one global model.
Where the emissions data come from and how they reach each sector.
From the model matrices to published factors, including price-year and purchaser-price adjustments.
How the emission factors of trade and transport margins are prepared.
The checks behind each release.
How the results compare with independent evidence.
The methods and data behind each country in the model.
Release notes, summaries of changes and change logs.
User guide¶
How to get the emission factors and apply them to your own data.