HappySqurriel on 11 December 2009
If we were to build a single city with the population density of Manhattan Island to hold the entire population of the earth it would be (approximately) the size of the state of Massachusetts ... When you start considering high-density food production (100 story hot-houses) the foot-print of man on the earth could be smaller than the state of Texas.
The only resource that limits our ability to grow endlessly is energy ... and it is entirely possibly (and potentially likely) that our ability to produce massive quantities of energy efficiently will dramatically increase over the next couple of generations.
