A study by a team of Caltech scientists questions the much-promoted environmental friendliness of hydrogen as a fuel for future fuel-cell vehicles (FCVs). The researchers warn that an expected 10%-20% leakage of hydrogen from FCVs, as well as similar losses from the hydrogen-production process, could cause a 10% decrease in atmospheric ozone. However, the scientists admit the replacement of fossil fuels with hydrogen fuel cells would improve urban air quality. Fuel cell-powered ...

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