A designer recently unveiled a model where communal bikes generate power to fuel city buses. The bikes braking system generates energy that's stored until they're plugged back into special bike racks. All the energy harnessed in the racks goes to a grid that fuels electric buses. Really!
http://www.engadget.com/2009/07/16/hybrid2-public-bike-concept-promises-to-help-power-city-buses/
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