World water crisis spurs inventors

Reuters: Solutions such as fog catchers, seawater greenhouses and fuel cells powered by microscopic bacteria are on show to help secure water supply and food production as rising population and climate change put the world's natural resources under strain. Water limits are close to being breached in several countries, while food output has to rise up to 100 percent by 2050 to sustain a world population seen growing by 35 percent from 6.9 billion to around 9 billion by that time, two U.N. reports have shown.......

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