March 6^th, 2018 Mathias gave a keynote lecure at the conference on nature-inclusive urban design in Amersfoort, organized by the branch organizations of landscape architects (NVTL), urban planners (BNS) and the network of green designers (NGB). He presented international examples of policy for nature-inclusive and biodiverse cities, such as the Singapore LUSH program, and the recent policies in The Netherlands, The Hague and Amsterdam. Policy and building regulations quickly adopt the idea of biodiversity increasing quality of life. In addition, policies are changing: from stimulating, or suggesting they become comprehensive and compulsory. Finally, more evidence and research is coming up that prove the (economic, but not limited to those) values of more biodiversity in the city.