Why? Cities are a source of huge environmental impact while also being vulnerable to increasingly extreme climate conditions. Nature can be a source of solutions and bringing nature into cities can also help dealing with numerous environmental, social and economic issues. Nature Based Solutions (NBS) is the term used to cover a wide range of nature related interventions ranging from eco-systems services (such as the value of wetlands) to biomimicry (like natural cooling systems). Questions are emerging regarding how NBS can offer economic and social opportunities that are more effective than conventional approaches.