The World Health Organization reports that for the first time ever, the majority of the world's population lives in a city, and this proportion continues to grow with projections of 70 percent by 2050. Currently, around half of all urban dwellers live in cities with populations between 100,000 and 500,000 people, and almost 10 percent of urban dwellers live in megacities, which are defined by UN HABITAT as a city with a population of more than 10 million.