Water shortages to be key environmental challenge of the century, Nasa warns
Freshwater supplies have already seriously declined in 19 global hotspots - from China to the Caspian Sea - due to overuse, groundbreaking study shows
Water shortages are likely to be the key environmental challenge of this century, scientists from Nasa have warned, as new data has revealed a drying-out of swaths of the globe between the tropics and...
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