More than ever before, customers are requesting carbon footprint and sustainability information on the products they purchase. In the automotive industry, supply chains are oftentimes long and complex. BASF, Motherson and Porsche – representing a simple automotive value chain – have teamed up with the Berlin startup CircularTree to bring CO2 data into one place. CarbonBlock, the developed blockchain application, makes greenhouse emissions of supply chains transparent. It provides companies with “smart contracts”, which make it possible to digitally forward the CO2 emissions of components along the supply chain, in order to quantify a product’s carbon footprint in a standardized way. The objective: developing a standardized solution, which allows the traceability and calculation of product carbon footprints.