More than a million residents living in Peru's capital Lima do not have access to running water.
But in the arid hillsides surrounding the capital - the second driest in the world - farmers are using simple fog nets to catch moisture in the air.
The area's thick fog condenses on specially erected mesh nets, and drips onto a plastic gutter before collecting in a storage tank. The water is then used to irrigate crops on once barren land.
Russell Beard travels to the foothills of the Andes to see landscapes and communities transformed by these simple fog catchers.
earthrise can be seen each week at the following times GMT: Tuesday: 2230; Wednesday: 0930; Thursday: 0330; Friday: 1630; Saturday: 2230; Sunday: 0930; Monday: 0330; Tuesday: 1630.
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