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Hot Cities - Meltdown!

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Many of our cites are running short of fresh water.  “Hot Cities” goes to Lima in Peru, one of the driest cities in the world that relies heavily on the water from three rivers fed by glacial melt. As the city swells in size the demands on the water supply are increasing. Already there's not enough to go round. 

We visit the shrinking glaciers and the city's “fog-catchers” – a beautifully simple idea that would work anywhere the mists roll in off the sea. California, for example.

Supported by the Rockefeller Foundation.

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