has consistently ranked “water crises” as among the global threats with the greatest potential impact — above natural disasters, mass migration and cyber-attacks.
Groundwater provides drinking water to at least half of humanity, and accounts for more than 40% of water used for irrigation. “Today people live in places where we are effectively using all the available renewable water, or, even worse, living on borrowed time by over pumping non-renewable ground water,” he told AFP.
“Half a billion people in the world face severe scarcity all year round,” said Arjen Hoekstra, a water management expert at the University of Twente in the Netherlands. “Climate changes caused by humans are driving changes in our water resources and demands,” Gleick told AFP. “As climate change worsens, impacts on water resources will also worsen.”California has just emerged from a five-year drought, the worst on record. In 2014-15, Sao Paulo’s 12 million souls came close to its own “Day Zero”. Beijing, New Delhi, Mexico City and Las Vegas are among other cities that have been facing “huge water supply risks for more than a decade”, noted Hoekstra.
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