Droughts could be consigned to history after scientists invented a water harvester that can pull moisture out of the air using only the power of the Sun.
The prototype, designed by scientists at MIT and the University of California, works even in desert conditions and could eventually provide households with all the drinkable water they need, simply by extracting dampness from the surrounding atmosphere.
The solar-powered harvester can provide 2.8 litres of water from the air over a 12 hour period in conditions as dry as the Mojave Desert, where the average humidity is around 20 per cent.
"This is a major breakthrough in the long-standing challenge of harvesting water from the air at low humidity," said Professor Omar Yaghi, at UC Berkeley. "There is no other way to do that right now, except by using extra energy. Your electric dehumidifier at home produces very expensive water."
The device is an open air chamber containing a lattice-like structure made from zirconium metal and adipic acid sandwiched between a solar absorption panel and a condenser plate. The zirconium and acid structure traps the water vapour then sunlight drives the water towards the cooler condensing plate which returns the vapour to liquid water so it can drip into a collector.