Capturing water from fog - on a large scale - could provide some of the driest cities in the world with drinking water. This is what researchers in Chile have concluded after studying the potential of fog harvesting in the desert city of Alto Hospicio in the north of the country.

With less annual rainfall than 1 mm per year, Chile's Atacama Desert is one of the driest places in the world. The main water source of cities in the region are underground rock layers that contain water-filled pore spaces which last recharged between 17,