The Water Knife by Paolo Bacigalupi. Extrapolates this very scenario in a frighteningly convincing way, IMO.
Also, his Ship Breaker trilogy, which I've read two thirds of, and which seems to be set in the same or a very closely related universe. (It's described as "young adult", but didn't feel all that childish to me.)
[EDIT: Tpyo]
Also, his Ship Breaker trilogy, which I've read two thirds of, and which seems to be set in the same or a very closely related universe. (It's described as "young adult", but didn't feel all that childish to me.)
[EDIT: Tpyo]