Globally, there are parts of the world, like Africa, that have endured long droughts where they did not have enough drinking water and had to get it from other countries. Well, in India, where the Team will be in a few weeks, there are ongoing dam building projects that are destroying communities , leaving thousands homeless, and forever changing natural environs. The justification for these dams comes from statistical data gathered by the government which projects how much water will be needed in the coming years. The dams store water and the government can regulate usage to those areas that are in need. The problem with this scenario is that people waste water.
People use too much water on frivolous activities, which then drain the current supplies.
If people could conserve water, they would not need the dams, communities in the dam construction areas would be spared relocation, and eons-old forests and farming land would be preserved for future generations. Vocabulary frivolous - doing something that isn't necessary or doing it without thinking about the consequences. In the US we see similar happenings. You use maybe two gallons of water. Your brother or sister does the same thing, as do your parents, your neighbors, their neighbors, and their neighbors' neighbors .