In August 2024, the U.S. Army Corps of Engineers released a Draft Integrated Material Management Plan and Environmental Impact Statement as part of its Lower Columbia River Channel Maintenance Plan. In the EIS the Corps cited values for the social cost of greenhouse gases (SC-GHG) from the calculator on Policy Integrity’s Cost of Carbon Website. These updated values, published by EPA in 2023, are the most robust, scientifically-supported, and comprehensive climate-damage estimates currently available. The Corps also citied our Cost of Carbon website when describing the SC-GHG in the Draft EIS.