The world is urbanizing. In 2050 over 6 billion people will live in cities. Climate change will have major impact on cities causing floods, droughts and heat waves. Nature based solutions such as green roofs, green facades, green space and urban forest are innovative and promising solutions for climate resilience and increased liveability of cities. Wageningen University & Research has a broad knowledge on blue and green approaches and nature based design for cities providing an evidence base about costs and benefits for climate resilient cities.