There are many countries across the globe that utilize natural gas as transportation fuel. Argentina and Iran are among the world leaders. It is a trend that hasn't really picked up in the U.S. -- until now.
Natural gas is too cheap and too useful to ignore, and it is making inroads in the world of long-distance trucking. In this video, Fool.com contributor Aimee Duffy talks about the efforts of UPS (NYSE:UPS) and Wal-Mart (NYSE:WMT) to take advantage of this growing movement.
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