The basic idea for software that could make supply chains transparent was one that Patrick Kölsch had had before the founding of greenable, while he was doing his doctorate at the RPTU Kaiserslautern. Back then, a research proposal of his was rejected, but the positive feedback for the idea itself (“Keep at it, this is a hot topic”) motivated him. It is indeed a hot topic: In just a few years the digital Product Passport will become mandatory. Companies will then have to disclose how much CO2 is in their products – from the procurement of raw materials to production to the product’s entire life cycle.