The impressive Human Population Through Time video, which you will see below, describes the increase in the Earth's population over the last thousand years. You will notice that it took a long time for the population to explode.
To be more specific it took us 200 thousand years to reach the first billion people, but only 200 years to hit the seven billion mark. 
Watch the video with the map that tracks the growth of the world's population. The video shows how we spread around the world and highlights empires and historical events over the years.
The very interesting Human Population Through Time video that you will watch was uploaded to YouTube by American Museum of Natural History or American Museum of Natural History.
Watch it
