In the next 30 years, cities worldwide will be forced to change in ways never seen before. Sustainability will no longer be an enticing feature; it will be the driving force behind any major city. Sustainable cities of the future will be bigger, greener, and more intertwined with technology. There will be multiple instigators behind this shift. Climate change and advancement in technology are the obvious ones, but they’re unlikely to be the most potent forces. The main reason cities will be forced to become significantly more sustainable will be due to population surges. Our world is already changing. Planning for this growth has been well underway for some time, and exciting ideas are starting to come to fruition. With the advent of smart technology and a greater emphasis on protecting the environment, we’re closer to the cities of the future than we realize. These predictions can become a reality if the world keeps moving forward like it has been for decades. Sustainability will be the focus of all this and will be a critical driving force for this generation and the next generation to create a more sustainable and cleaner world.