If you live in one of the world's busiest and most crowded cities, things are only going to get worse over the coming decade, according to an analysis conducted by Bloomberg. Major cities are set to feel more claustrophobic in line with the world's rapid population growth. Hong Kong is a prime example. Over the course of one generation, population growth will stand at 32.8 percent. Back in 1995, the city's population per square mile stood at 57,965. In 2025, that number will reach 77,000.