Add salt as required: the recipe for fresh water

Clean drinking water...not self-evident for ev...
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Using to slake the world’s thirst has been an uphill struggle, but now we’re learning to go with the flow

STROLLING along Williamsons beach, a quiet strip of sand about 100 kilometres south-east of Melbourne, , you would never guess that a monster lurks just behind the dunes. Nestled at the bottom of a 27-metre-deep pit is a 500-tonne mechanical giant that is about to begin burrowing under the beach and out to sea. In its wake the machine will leave a 4-metre-wide, 1.5-kilometre-long tunnel, the inlet for one of the world’s largest plants to turn into drinking .

Australia is turning to desalination as fresh water in many parts of the country runs short following years of drought. It is not alone. Many countries are eyeing the oceans as a potential source of as populations grow and rainfall patterns change. Even the relatively rain-drenched UK now has its first large-scale desalination plant, opened earlier this year on the river Thames in east .

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