Crucial supplies of water in China, the US, India and other large economies are dwindling so fast that the threat to the world’s water security is far worse than is commonly understood, a prominent hydrologist has warned.
Groundwater in soil and aquifers accounts for up to one-third of water used globally and is the main source of water for more than 2bn people.
It accounts for about half the water used to grow food and is an important reserve during serious droughts, such as those gripping California and Brazil at the moment.
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