Rapid urbanization is a global phenomenon, and the United Nations predicts that by 2050, 68% of the world's population will live in cities. While the dense and complex city offers many benefits and opportunities, unplanned urban growth creates precarious living conditions for millions of people. When considering the future of our cities, environmental and social sustainability must be given the highest priority. Architects, urban planners, and designers will all have important roles to play in developing new solutions.