Aspen Ideas Festival: Transportation for the 21st Century
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Ford workers assemble a Ford ST gasoline-powered vehicle at the Michigan Assembly Plant on Nov. 8, 2012 in Wayne, Mich. The plant is the only one in the world that builds vehicles with five different fuel efficient powertrains on the same line. Ford held an event at the plant that celebrated the launch of the C-MAX Energi plug-in hybrid.
Getty Images/Bill Pugliano
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