We are facing a broad range of challenges, such as unsustainable urbanization and related human health issues, degradation and loss of natural capital and the ecosystem services it provides (clean air, water and soil), climate change and an alarming increase of natural disaster risks. Currently over 70% of Europe's population live in cities, expected to increase to over 80% by the middle of the century. This translates to 36 million new urban citizens, who will need housing, employment and care by 2050.