Solar cells can take sunlight and produce a current, giving instant power. But as soon as the Sun goes down, the lights go dim. If you could turn sunlight into fuel - to use for transportation or simply to store for later - you'd be on to a good thing. Nature can already do this thanks to photosynthesis. Green plants take water, sunlight and carbon dioxide to make sugars and starches. This provides all the fuel they need, and most of the fuel we need too, in the form of food or oil.
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