A worker checks the water gauge at a desalination plant in Singapore.
(ROSLAN RAHMAN/AFP/Getty Images)
Few geographic constraints are more universal than water scarcity. Though every country sees it in different ways and to different degrees, water stress is a problem that even water-rich states like Canada experience. As water resources become increasingly strained in some of the biggest cities and most populated countries, improvements in purification technologies will be important for more effectively using the limited water the world has left. Materials such as graphene are already paving the way to cheaper, more effective and more energy efficient filtration methods. ...
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