Each week, in countries around the globe, nearly a million people say goodbye to their homes in impoverished rural regions—and move to even worse conditions in cities. This program explores the tragic results: illegal slums filled with some of the poorest people in the world, lacking water, sanitation, and other resources needed to support exploding populations. Viewers are shown the lives and homes of those who struggle in the slums of Mumbai, India, and Rio de Janeiro, Brazil, and who face the threat of eviction, the spread of disease, and rampant drug dealing and gang violence on a daily basis. Slum residents, as well as those who have broken out of the cycle of poverty, share their personal insights and frustrations regarding this urgent international issue. (46 minutes)