Is there a fundamental flaw in our Western thinking that has led us into the current complex crisis of climate change, loss of biodiversity and scarcity of resources? What can we do, what must we do to come to terms with nature and its great, overarching cycles in a densely populated world? Because this is entirely possible if we make a number of adjustments to our living conditions… including for urban life: the dense city can become nature, in whose great, overarching context we integrate: the city as a biotope, Biotope City.