• http://www.vector1media.com/spatialsustain Matt Ball

    Love the idea, but a better power source might be the natural electricity in trees. Scientists found electricity in trees and are working to store the millivolts of energy to produce enough power to run low-power sensors. Perhaps the same concept could act as the sole power source for these invisible streetlights or as a backup power source for a series of cloudy days.

    See this story on Huffington Post:
    http://www.huffingtonpost.com/2009/09/11/scientists-draw-electrici_n_283244.html