General Motors Detroit-Hamtramck plant workers walk along the assembly line to an event celebrating the production of the Chevrolet Volt electric vehicle with extended range capabilities Tuesday, November 30, 2010 in Detroit, Michigan. GM announced the Volt will soon be shipped to dealers in initial launch markets, and that GM will add 1,000 engineers and researchers in Michigan over the next two years, to expand its vehicle electrification expertise and the development of electric vehicles. (Photo by Jeffrey Sauger)
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