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August 7, 2019 05:25 pm

A Quarter of Humanity Faces Looming Water Crises

Countries that are home to one-fourth of Earth's population face an increasingly urgent risk: The prospect of running out of water. From a report: From India to Iran to Botswana, 17 countries around the world are currently under extremely high water stress, meaning they are using almost all the water they have, according to new World Resources Institute data published Tuesday. Many are arid countries to begin with; some are squandering what water they have. Several are relying too heavily on groundwater, which instead they should be replenishing and saving for times of drought. In those countries are several big, thirsty cities that have faced acute shortages recently, including Sao Paulo, Brazil; Chennai, India; and Cape Town, which in 2018 narrowly beat what it called Day Zero -- the day when all its dams would be dry. Climate change heightens the risk. As rainfall becomes more erratic, the water supply becomes less reliable. At the same time, as the days grow hotter, more water evaporates from reservoirs just as demand for water increases. Water-stressed places are sometimes cursed by two extremes. SÃ£o Paulo was ravaged by floods a year after its taps nearly ran dry. Chennai suffered fatal floods four years ago, and now its reservoirs are almost empty

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