Exponential growth doesn't work forever. As recently as 100 years ago there were less than 2 billion people in the whole world. At 7.8 billion and growing 80M [

Exponential growth doesn't work forever. As recently as 100 years ago there were less than 2 billion people in the whole world. At 7.8 billion and growing 80M [1 Germany] each year, we're running out of room to breathe.