I have been thinking about this a lot lately! When I was born the population was 5 billion. When my father was born the population was 2.5 billion. You have to

I have been thinking about this a lot lately! When I was born the population was 5 billion. When my father was born the population was 2.5 billion. You have to go back several more generations to get to the 1 billion mark. The growth within the last couple generations has been crazy!