India (overpopulation)
India's population is now 1.2 billion, and with this many people, the people there can only use 1 million liters of water per person. As early as 2040 their population is expected to grow to 1.8 billion, and if this will be true there will be less and less water to use per person and they will need more and more water, but India doesn't have enough under groundwater. According to the National Institution for Transforming India (NITI), 70 percent of all of the country's freshwater is contaminated. So it means if they think they could use under groundwater if they really don't have enough water because almost all the rivers in India are already polluted by chemicals, and people there will dump dead bodies or garbages they throw-in they all throw it in the Gangers River. Just because they got too many people in their country so even if they didn't pollute this much river they still don't have enough water for everyone in their country, their population is expected to grow more and this means their population can grow more than 1.8 billion. Now they only have 1.2 billion people, but so if the population really grow to 1.8 billion or more, the water they get will just be less then 1 million of water per person.