The Carbon Footprint is defined by standard ISO/TS greenhouse gas emissions (3.1.3.5) and removals (3.1.3.6) in a product system (3.1.4.2), expressed as CO 2 equivalents (3.1.3.2) and based on a life cycle assess ment (3.1.5.3) using the single impact category (3.1.5.8) of climate change.