Download the 2026 GHG Emission Factors Hub

Cornerstone’s goal is to accelerate impactful sustainability work by providing high-quality, open environmental data for businesses, governments, researchers, and other organizational users. When we launched in 2025, Cornerstone focused on the two most widely-used multiregional input-output data models: USEEIO and CEDA, used by over 65% of organizations to calculate their scope 3 emissions footprints.

Today we’re announcing an important step forward in our mission: expanding our data model coverage to include data for scopes 1, 2, and 3, starting with the addition of the GHG Emission Factors Hub (Hub), one of the most broadly-used resources in corporate greenhouse gas accounting. With the addition of the Hub, companies now have free open access through Cornerstone to all data needed to calculate a scope 1, 2, and 3 carbon footprint.

The Hub consolidates key United States data sources—including eGRID and the Waste Reduction Model (WARM)—into a single, easy-to-use set of emission factors. Roughly 80% of American companies use the Hub for measuring and reporting scope 1 emissions. The last version of the Hub was released in January 2025 by the U.S. Environmental Protection Agency Center for Corporate Climate Leadership. The 2026 edition of the Hub builds on previous versions released by the EPA. This update includes eGRID factors; air travel factors for Category 6: Business Travel and Category 7: Employee Commuting; and updated refrigerant blends and GWPs to align with IPCC AR6.

WSP in the U.S. and ERG, the consultancies that maintained the Hub with the EPA, will continue their work under Cornerstone. WSP will join Cornerstone as a collaborator on the Hub, leading the continuous technical development of the dataset and responding to technical inquiries from users. ERG is a founding member of Cornerstone.

For the 2027 edition and beyond we are working on the technical roadmap and welcome feedback from Hub users on what would be most useful. For questions and feedback, please reach out to team@cornerstonedata.org