In a rural southwest region of Morocco, rainfall is unpredictable and underground aquifers have been largely depleted. Average annual precipitation is only about 5 in. However, the region does have one precious resource. Because of its unique climate, heavy fog appears an average of 143 days a year, caused by warm air driven inland by ocean currents. As the humid air rises, it hits the barrier of the Anti-Atlas mountains and turns into thick blankets of fog. Over the past 10 years, a non-profit organization called Dar Si Hmad has set up the largest fog-harvesting project in the world. Huge mesh nets capture water particles, which then condense and drip into collection trays. Roughly 1,600 gal. of water are collected daily and pumped through 5 miles of pipes to reservoirs where itís filtered for use by about 400 people living nearby.