What would happen if the world ran out of fresh water?
Humans, as well as most other animals would have a lot of trouble
remaining healthy; they simply couldn't deal with the impurities in
any other kind of water. Animals which depend on the presence of
fresh water, such as fish and insects which live in it, would soon
become very rare or even extinct. However, those which live in salt
water or do not depend directly on fresh water for the health would
be fairly well adjusted to that kind of world and would eventually