Looking back at the past, present and future world population

The world population is growing rapidly, if it comes back to 200 years ago, according to an estimated world population of less than 1 billion, the world population today is more than 7 billion . Rapid population growth has become a major concern as countless social and ecological problems have become increasingly alarming.

Let's take a look at a few numbers, causes and consequences as well as how to make the world better and better.

1. Video: World population development history
2. Only 3 of the 7 billion people in the world have a special red passport