Scientists at Harvard have developed a technology that mimics the way leaves produce energy from sunlight, water and air. A device about the size of a credit card, the “bionic leaf” includes a solar panel. When placed in water, it uses energy from sunlight to split the water into hydrogen and oxygen.
+Read MoreThe poorest cities on Earth have the worst air pollution, data revealed today by the World Health Organization shows. More than 80 percent of the people living in cities that monitor pollutants in their air are exposed to levels up to 10 times higher than WHO limits.
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