Is the world heading for a population explosion? How many people can the planet sustain? With the world's inhabitants passing the seven billion count and predicted to hit nine billion by 2050, the world is on the brink of a number panic. A new addition to this acclaimed series takes a closer look at what these numbers mean, why women in most parts of the world have fewer children, what societal changes this increase will initiate and how having babies relates to climate change.
