Auto dimming street lights, can save an amazing amount of energy.
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In this video watch the first Smart Street Lights powered by footsteps and the Sun.
All 250,000 NYC street lights will be replaced with energy-efficient LEDs, in the largest LED retrofit in the U.S. New York turning from day to night.
A group of scientists in Taiwan recently discovered that placing gold nanoparticles within the leaves of trees, causes them to give off a luminous reddish