Heavy rains, storms, and floods – cities worldwide are confronted with the effects of global climate change. Ecology and infrastructure must therefore be conceived of holistically, and the city understood as a climate conditioning machine. New techniques and construction methods are just as essential as the planning of green spaces. In Germany, more than 66 hectares of grey infrastructure – i.e. areas for traffic and housing developments – are constructed daily. However, a sustainable city also requires green infrastructure. What new hybrids can determine a more harmonious interplay between urban infrastructures and the limited nature that surrounds them?