We'll fight each other over fresh water supplies long before we're shoving each other into the sea.
The looming water crisis is a particularly big problem in California, Arizona, and parts of the Southwest. Interestingly, farmland irrigation accounts for a bigger drain on water than almost all of the nearby cities combined.
Growing crops with desalinated water costs more for the energy to produce the water than the price of the crops grown. That's why desalinated water tends to only be used for domestic supply. The real problem is energy price.
The looming water crisis is a particularly big problem in California, Arizona, and parts of the Southwest. Interestingly, farmland irrigation accounts for a bigger drain on water than almost all of the nearby cities combined.