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Most modern cars run by burning gasoline in an internal combustion engine. Recently there has been an increasing concern with the amount of pollution produced by engines of this type. Mechanical engineers have been responsible for making these engines more efficient in recent years, and in reducing emissions, but there is an increasing public desire to eliminate polluting emissions entirely. This is most clearly demonstrated by California's law requiring a certain percentage of the cars sold in California to be "zero-emissions cars" by the year 2000.

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