Even if man was able to come up with a method that did not require the use of nature to survive, we would still want to conquer it, to use it, to eat it. Curing the cravings of man is an ongoing nightmare. Evolution may one day solve the craving issue, but then what would we do, where would we go, what would drive and motivate us to do anything? No food needed, just water and a few micro minerals, we would all grow roots and do like trees and plants sit around waiting for something to come and end our lives.