Its shape is a little hard to describe in words, so check out the picture in the first link below. Basically, a solar tree is a form of night lighting that could replace conventional streetlights on European streets. Each tree has several branches, each holding a solar lamp that absorbs light and then lights up at night by using a light sensor. The systems are efficient, able to turn on even after a completely cloudy day. The designers hope that these same solar cells can be placed on other structures around cities for green street lighting, and are also designing a green car.
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