http://www.cnn.com/2008/TECH/science/08/01/Human.power/index.html
The power generating floor is pretty cool. http://www.asiaisgreen.com/2008/06/03/lessons-from-power-generating-floor-at-train-station/
Now, if they're really smart, they'll take these devices and build them into playground equipment for young children. Then we can harness all that power for good.
interesting concepts, but they're gimmicky distractions from more feasible energy solutions. Another example of companies trying to cash in on the word "green" attached to anything. "Come to our air conditioned, bass-pounding dance club - dancing like an idiot will power these 3 LED's so you can feel good about yourself for 'saving the environment.' Here's your $20 imported shot."
The energy and environmental impact from designing, building, and using that kind of thing likely negates any small amount of energy generated.
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