How to Pull Water Out of Thin Air, Even in the Driest Parts of the Globe
Scientists have developed a device that can suck water out of desert skies, powered by sunlight alone. They hope that a version of the technology could eventually supply clean drinking water in some the driest and poorest parts of the globe.
The device is based on a novel material that can pull large amounts of water into its many pores. According to a study published in the journal Science on Thursday, a kilogram of the material can capture several liters of water each day in humidity levels as low as 20 percent, typical of arid regions.
The technology could help address a big and growing problem. A report last year in Science Advances found that four billion people, nearly half in India and China, face “severe water scarcity at least one month of the year.” That means water shortages affect two-thirds of the world’s population. These shortages—and the resulting conflicts—are only expected to become more common in large parts of the world as climate change accelerates.