On the edge of the Sahara in southwest Morocco, giant moisture-catching nets are turning fog into drinking water. According to Dar Si Hmad, the female-led Moroccan NGO that runs the initiative, it is the world’s largest fog collection project. Spanning 600 square meters, the fog nets now provides drinking water to 500 people in five villages.
The fog-catching technique involves a fine mesh on which tiny fog droplets – typically 1 to 40 millionths of a meter – gather and merge until they have enough weight to travel down into a reservoir.
Fog harvesting was first devised in South America in the 1980s. Today there are active projects in various countries including Chile, Peru, Ghana, Eritrea, the USA and South Africa.