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 .

Australia is turning to desalination as fresh 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 drinking 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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