Like in many other European countries, the temperature record in the Netherlands was broken in the summer of 2019. In the city Gilze and Rijen it became 40,7 °C. Even more remarkable: this was two degrees above the old record, 38,6 °C measured on 23 august 1944! Across the world, the weather becomes increasingly weirder, and above all, warmer. To stop this climate change, a world-wide transition to a so-called circular economy is needed. A definition to measure the ‘circularity’ of products and services is however missing. An increasing number of companies say they are on a mission to become 100 % circular, but what they mean remains unclear!