Scary stat: World population to hit 7 billion

(CNN) - The world population is expected to hit 7 billion Monday.

According to the UN Population Fund, the Earth's population grew by 1 billion people in the last 12 years.

That's quite a bit considering it took until the early 1800s just for the population to reach its first billion.

Just to get an idea of just how big seven billion really is:

  • To count that high would take more than 30 years.
  • And 7 billion seconds ago, the year was 1789.

Copyright 2011 CNN. All rights reserved.