Conservationist Kai Tiedemann (front) and local worker Segundo Velasquez inspect a net in April 2007 that Tiedemann and Anne Lummerich designed to collect water from fog in Bellavista, Peru.

Although fog collection isn't practical on a large scale, in small communities such as Bellavista--where water can't be obtained from wells, rain, or a river--the technique can be a lifesaver, freeing poor people from high water prices.