Not only does the world population grow, but it also consumes more and more fresh water per person. Add to this that the drinking water is ever more highly polluted with industrial waste and manure. All of this results in a decreasing amount of drinking water being available for an increasing number of people. That in itself may cause conflicts, not to mention the fact that the supplies of drinking water are often managed by different countries simultaneously. Plus global warming to cap it all.
Higher temperatures lead to more evaporation of the available water, which means less water.
Another additional effect will be felt in coastal areas in particular. Due to the phreatic decline the level will be supplemented with salt seawater. This makes it unsuited for agricultural purposes or household use. Coastal cities or agricultural communities will therefore have to start looking for other sources of fresh water, which are scarce enough as it is. The social impact People often tend to talk exclusively about the measurable and visible consequences of the greenhouse effect.