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How Energy Efficiency is "Lighting Up" the Streets of Philadelphia

Not just in homes and buildings, Philadelphia has revved up its energy efficiency campaign in the streets. Through the Greenworks Philadelphia project, the Philadelphia Streets Department is converting 58,000 yellow and green traffic signals to LED lights, replacing traditional energy-draining bulbs and saving the city $1 million of electricity costs every year.

BMW Unveils Electric Car Models

BMW unveiled two plug-in electric cars yesterday both headed for production beginning in 2013 -- the sporty i8 hybrid super-coupe and the i3 urban all-electric car, a small vehicle designed to go about 80 miles between recharges.