Researchers are studying and updating centuries old solar still technology to use sunlight to purify water.
This comes as the majority of the world experienced a summer of extreme heat and drought, making water scarcity an issue. The World Health Organization says more than two billion people around the world lack easy access to clean water.
The solar still technology is a long way off from producing enough water, but once perfected, it could become valuable for farmers in off-grid and coastal communities by turning seawater into freshwater.
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