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Glug-glug: Not normally a sound of foreboding. But mankind's most serious challenge in the 21st century might not be war or hunger or disease or even the collapse of civic order, a UN report says; it may be the lack of fresh water.
Population growth, pollution and climate change, all accelerating, are likely to combine to produce a drastic decline in water supply in the coming decades, according to the World Water Development Report, published today. And of course that supply is already problematic for up to a third of the world's population.
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