By Ryan Schleeter, National Geographic More than 50% of the world’s population already lives in cities, and this number is expected to grow to a whopping 70% by 2050. More and more people move to the world’s fastest-growing cities each day—Karachi, Pakistan; Shenzhen and Beijing, China; Lagos, Nigeria; and Bangkok, Thailand, lead the list. Most of these migrants move from rural areas to megacities, not … Continue reading Our Urban Future in Film