GHG Projections should clearly document the “data, methodologies, and assumptions used,” so that others can understand and replicate projections based on the information in the BTR. It would be acceptable to use the data from an earlier publication, or an assumption based on earlier inventory reporting, as long as it well-documented in the report. In any case, this can be listed as a “Data Gap” and an area for future improvement in the BTR sections on future needs.