"This is the point in a discussion on population, where we often come to the question: ‘So, how many people can the planet sustain?’"
Image: An overcrowded train transports Muslim devotees returning from the World Moslem Congregation near Dhaka, Bangladesh. (MUFTY MUNIR/AFP/Getty Images)
"Looking into the UN’s crystal ball predicts that population will continue to grow and then plateau around ten billion by 2100. This is the middle estimate. The lower estimate suggests a peak of about eight billion around 2050. The high estimate is for a staggering sixteen billion by 2100 and still climbing."