Answer:
De-salinization of ocean water
Step-by-step explanation:
A process which will be more costly a terms of energy consumption, men work, and is neither efficient or environmentally 'friendly' is obtaining clean amount of water to drinking purposes from the ocean or sea water. As the process will require more machinery and it will be much costly for the public to purchase.
The drinkable water or fresh amount required for a spending a healthy life can be obtained from any river or clean reservoir around the region, so, why waste time and money, along with the most important factor energy.