Ever since it was discovered, oil has controlled the economy of this plane. In not too distant future, I can see the water playing that role. If you have a doubt, think about the odd summer days when water supply is stopped and everyone is trying to get as much as they can from the water tankers. It has the potential to turn a civilized society into savages
One of the challenged we will be facing in the coming years will be provide clean drinking water to all people on this planet. I am sure someone must have already tried it but it is not popular to clean the sea water for drinking purposes. The majority of earth is oceans and that volume of water is going to only increase when the poles and the glaciers melt. We need to seriously consider this option.
Lets start to not keep the tap running while brushing teeth or shaving.