By using this site, you agree to our Privacy Policy and our Terms of Use. Close
Ka-pi96 said:

Aren't water, food and clean air all renewable resources?

Don't know how water works, but there must be some way it gets renewed, I dunno maybe when urine evaporates it takes all the pissy bits out and turns it back into water to rain down again or something?

Surely you were taught about the water cycle in science class when you were a kid.  You might as well get a refresher considering it is an important concept to grasp.