".."consider this. It took the earth's population thousand of years-from the early dawn of man all the way to the early 1800s-to reach one billion pe… - Dan Brown

".."consider this. It took the earth's population thousand of years-from the early dawn of man all the way to the early 1800s-to reach one billion people. Then astoundingly, it took only about a hundred years to double the population to two billion in the 1920s. After that, it took a mere fifty years for the population to double again to four billion in the 1970s. As you can imagine, we're well on track to reach eight billion very soon. Just today, the human race added another quarter-billion people to planet Earth. A quarter million. And this happens ever day-rain or shine. Currently every year er 're adding the equivalent of the entire country of Germany.