Population

World population 70,000 years ago was less than 1,000 human individuals. 

Yes we almost went the way of Neanderthal 35,000 years latter but vegetarianismed our way out of it.

Then 10,000 and 100,000 population numbers then 1,000,000 and 10,000,000 and 100,000,000 and by 1817 AD we had 1,000,000,000 humans alive on the planet.

Then 150 years later we had 3 times that 3,000,000,000

And 50 years after that 9,000,000,000

And 16 years after that 3 times more 27,000,000,000

Sorry have I miss spoken.

2016 AD we have 7.4 billion and may not make 9 billion.

If we do not make 9 billion then how do we make 27 billion?