You are No hybrid, sir. Are clean diesel vehicles a waste of time?

Sure, a clean diesel is nice, but a clean diesel hybrid is revolutionary

I was watching CNBC's coverage of the recent North American International Auto Show yesterday, a show where European automakers really tried to raise the image value of clean diesel vehicles, such as the VW Tiguan concept pictured here.

And what is not to like? Clean and powerful, plus a 25 percent increase in fuel efficiency over gasoline sounds pretty good.

Yet, if America converted its an entire fleet to clean diesel, instead of gasoline, it would take more than a decade. In that same time, it is predicted that America's energy consumption will probably increase by some 20 percent or more. So, what will have been gained? At best, America would be just as dependent as today on foreign oil by making this conversion.

Clean diesel hybrids, or clean diesel plug-in hybrids, however, could have revolutionary effects on foreign oil dependency. Why not invest in this future? Won't the costs pay for themselves in the long run?

More on clean diesel vehicles versus hybrid vehicles.