In this Aug. 11, 2012 photo, a truck, retrofitted to run on a barrel of burning wood, stops on a road in Hamhung, North Korea. (AP Photo/David Guttenfelder)

Associated Press
In this Aug. 11, 2012 photo, a truck, retrofitted to run on a barrel of burning wood, stops on a road in Hamhung, North Korea. (AP Photo/David Guttenfelder)
In this Aug. 11, 2012 photo, a truck, retrofitted to run on a barrel of burning wood, stops on a road in Hamhung, North Korea. (AP Photo/David Guttenfelder)
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