Quote Originally Posted by Bren122 View Post
Not entirely accurate- if we used medium density (two levels/floors) housing of 8 people per building and 4 people per level, at 2000 square feet each, the population of the Earth would fit into Nevada and Texas. by mid century they will have filled Arizona. whilst the population of the Earth is expected to reach @10 billion by 2050, it is only projected to reach @12 billion by 2100.
I believe large parts of Manhatten are higher two stories! And the determination was based on density of humans per square mile. Something on the order of 70,000 in 2000