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Oil companies serve up bio-diesel

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For years, environmental activists have been demonstrating that you don't need gasoline to fuel a car. Some people have been retrofitting cars with diesel engines that can be powered by restaurant grease. But with the price of oil soaring in recent years bio-diesel's been getting more popular. Brad Linder reports that it's moving from a fuel for hobbyists to an energy alternative that's even getting the attention of oil companies.

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