There are 7.2 billion people in this world. Trying to visualize that number is overwhelming, to say the least. But what if that number were reduced to a mere 100? The project "100 People: A ...

Since then, three billion more people have been added to our global community. But the next 35 years could see a rise of only two billion - and then the global population is likely to plateau.

Where do most people emigrate ... This is Population Support. 7% of the 108 billion who have ever taken a breath. Here's a question from Quora. Is the majority of the world's population children ...