BERLIN, GERMANY - MARCH 15: A Volkswagen XL1 plug-in diesel-electric hybrid automobile sits on display at the Electric Mobility Week (e-Mobilitaetswochen), a public Volkswagen (VW) event at the former Tempelhof airport, on March 15, 2014 in Berlin, Germany. The event was designed to promote the company's e-Golf und e-up! automobiles, as well as its other alternative energy powered vehicles. (Photo by Adam Berry/Getty Images)
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