One Third of World's Population Face Water Shortages
Natural forces, overuse and resource mismanagement have contributed to a quarter of the world living in areas of "physical water shortage," where water simply doesn't exist. Others live in areas of "economic water shortage," in which water exist but people don't have the means to access it, either because of poverty or dysfunctional governments.
Either way, continued water shortages will have a cascade effect in the coming years as lack of water leads to reduced crop output and food production, sanitation problems and conflicts between nations.
Source: Financial Times