Water crises in South Africa, India, and other regions are just the start. Two-thirds of us, writes Rachel Berkowitz in Physics Today, may live with water shortages in 2025. Desalination methods to convert seawater to freshwater use decades-old technology but new salt-filtering membranes made of graphene could make the process more efficient. As usual, the issue is scale-up. Read about the science in @PhysicsToday. See more from @rdberkowitz at rberkowitz.net image: AlexanderAlUS CC BY-SA 3.0
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