The United States consumes approximately one fourth of the world's oil, with a large portion used as gasoline in passenger vehicles. Burning gasoline is costly and creates serious environmental problems. When we estimate 25% of total vehicles in use will be hybrid vehicles by the year 2015, we can reduce the amount of gasoline burned by 12% and an educated estimate of saving just under 30,000 tons per year of nitrous-oxide emissions in California alone.
Worcester Polytechnic Institute
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