Water under threat: new technology is the answer

Earlier this year, Cape Town came within a few drops of Day Zero when the taps are turned off. A serious drought was only just averted. This year, already the fourth hottest ever, is not a one off. Europe's heatwave and drought have decimated crops, and could lead to spikes in food prices; California has been up in flames again, while Japan saw dozens of deaths from sweltering heat.

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