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Monday, 04 May 2009 21:00 |
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The United States consumes 25 percent of worldwide oil production, with passenger vehicles accounting for about 40 percent of that.
Those same vehicles emit an estimated 400 metric tons of greenhouse gases each year that pollute the air and the environment, and that affect human health. Concerns about air pollution, carbon-dioxide emission, and U.S. dependence on imported oil, along with record-high gasoline prices, are driving research into non-petroleum-based fuels and technology. Currently, some of the most promising alternatives include hydrogen fuel cells, ethanol fuel, and electricity from batteries.
Source: http://www.pbs.org/wgbh/nova/teachers/activities/3507_car.html |
