As cities are incredibly complex, so must be any sort of urban sustainability, which can come in many more forms than a ‘Green City’. With so much going on in an urban environment, there’s bound to be some excess energy flows. So why waste that energy, if you can turn it into something that’s better, fun, and productive? That’s what we call Parasite Urbanism — strategies and urban interventions that creatively make use of spaces or energies that otherwise would be neglected or would go to waste, contributing to a wider concept of urban sustainability. Let’s take a look at three of the best examples of urban parasites that we’ve highlighted on the Pop Up City. They all make use of a variety of otherwise neglected spaces or energy, launching them into places that are more useful, more productive and more fun!