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The exhaust pipes of a VW diesel car are photographed in Frankfurt, Germany, on Wednesday. German auto bosses, ministers and state governors are considering how to reduce diesel emissions as drivers face the threat of possible bans on driving older diesel cars in some cities. Michael Probst/AP hide caption

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Michael Probst/AP

Republican presidential candidate Mitt Romney speaks during a roundtable discussion on manufacturing this Wednesday in Bedford Heights, Ohio. MANDEL NGAN/AFP/Getty Images hide caption

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Workers assemble one of the many car models at Chinese carmaker's Chery Automobile plant in Wuhu, east China's Anhui province. STR/AFP/Getty Images hide caption

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STR/AFP/Getty Images

Are Chinese Exporters Cheating?

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