Remember the heat wave? You must - it was only a month or so ago. Now, take those temperatures and turn up the heat, so to speak, by a good 8 °C. Or for that matter, another 10°C. Now, take a good 38°C and couple it with scant shade ... and ... no water. Then, to this rather sweltering image, add this: If you want drinking water, you need to walk to go and find it. And not just down to the...

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