This International Standard specifies principles, requirements and guidelines for the quantification and 5 communication of the carbon footprint of a product (CFP), based on International Standards on life cycle 6 assessment (ISO 14040 series) and on environmental claims, labels and declarations (ISO 14020 series). 7 Requirements and guidelines for the quantification and communication of a partial carbon footprint of a 8 product (partial CFP) are also provided. 9 This International Standard is applicable to CFP studies and different forms of communication based on the 10 results of such studies. 11 Where the results of a CFP study are reported according to this International Standard procedures to support 12 transparency and credibility, and procedures to allow for informed choices are provided. 13 This International Standard provides for the development of CFP-product category rules (CFP-PCR), or the 14 adoption of product category rules (PCR) that have been developed in accordance with ISO 14025 and that 15 are consistent with this International Standard. 16 This International Standard addresses only one impact category, climate change. 17 Inclusion of offsetting in the quantification process is outside of the scope of this International Standard.