Since 1988, the population along China’s Pearl River Delta has grown by a whopping 32 million people. Now boasting a total population of 42 million, it’s the largest urban area on the planet. To put it into perspective, 42 million people is more than the population of Canada, Australia, or Argentina.
In 2008, for the first time in history, as many humans were living in cities as in rural areas. Over the decades, many cities have swelled to accomodate the growing human population as well as the growing trend toward urbanism. These are changes so extreme that they can be seen from space.