What might the city of the future look like and how might it meet the needs of future generations while limiting damage to our planet's fragile ecosystem? This book introduces pioneering architects, designers and planners whose visions for an alternative urban future address issues such as climate change, population density, infrastructure, transportation and digital culture. It includes over 40 radical projects grouped into five key categories: master planning and megacities, transportation and infrastructure, new habitats, green cities/ urban farming, and smart cities. Each category summarises trends that will drive the development of future cities, with each project representing a unique approach to urban development in the 21st century and beyond.