Droughts in the Southwest and disappearing lakes in the Southeast of America, and increasingly arid areas in other parts of the world.
Australia is copping the rough end of the stick with respect to Global Warming - it never rains in their catchment areas any more; their cash-starved state govt. in New South Wales has just started building desalination plants and that's no solution because they only belch out CO2 and contribute further to Global Warming.
It's become so bad that the UN has forecast two thirds of the world's population will live in areas that are water-stressed by 2030.
Hundreds of billions of dollars will be spent to avoid this crisis. And savy investors will make a fortune.