I heard from a source that there are more people alive today on Earth than dead people. Meaning there are more humans alive today (7.8 billion) than all of the former living humans in the past combined. I remember when I was a young juvenil when the world population was 2.5 billion and McDonalds was celebrating that they have sold 500,000 hamburgers. Holy crap !!! There were only 1 billion people living back in 1800.
I think it very possible that only 15 billion people have ever been born on Earth. I think we have a very serious problem with overpopulation on Earth today.