By 2050, nearly 10 billion people will share our planet. As mega-cities rise and technology reshapes the urban landscape, how will these changes affect the vast majority of the world’s poor? The Future of Cities is part of What Happens Next, a series of deeply reported short documentaries that examine aspects of life poised to transform radically in the next decades. We’ve spent two years traveling the world to find the people who aren’t simply making predictions about the future, but are already living them out.