How Many People Can The Earth Hold?

[darkbeaver]

http://www.youtube.com/watch?v=wEGYvLo4N-Y

Petra (Jordan) famous underground city. These underground dwellings are massive and spread globally. All of them exhibit stone excavation thought to be beyond todays engineering capabilities.
http://www.youtube.com/watch?v=wEGYvLo4N-Y

 

[spaminator]

http://en.wikipedia.org/wiki/Hollow_Earth

 

[Blackleaf]

Earth isn't overpopulated. It's a myth.