Draft PDS-02 Addendum 66f, CO2 Index RESNET Standard Development Committee 300 has approved Draft PDS-02 of Addendum 66f for public review and comment. The addendum establishes criteria and identifies data necessary for the calculation of a CO2 Index. The Index is based on Minimum Rated Features currently collected by raters and does not require additional data to be collected or input into ratings software. Rating software will calculate and print the Index automatically. The draft addendum, comment form, and comments received are posted at Draft PDS-02, MINHERS Addendum 66f, CO2 Index. Public comments will be accepted from May 11, 2022, through June 9, 2022.