Plastic funnels collect fog-water dripping from river she-oak trees planted in Bellavista, a small hillside settlement outside Lima that receives very little rainfall.

Desert and other dry communities around the world started harvesting fog-water dripping from trees as far back as 2,000 years ago.

Before fog-catching nets were installed, Bellavista residents relied on water that was trucked in, often paying ten times as much as people farther downhill who are connected to the municipal water supply.