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Hummer 02 concept
Hummer 02 concept
This was the Hummer that never was and probably never would have been. It was the ultimate antidote to Hummer's un-green image. The O2 concept was not only emission-free -- it ran on a fuel cell -- its algae-filled body panels were designed to produce oxygen.

The O2 existed only as a drawing submitted for a design competition in late 2006.

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Last updated February 25 2010: 1:48 PM ET
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