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Author Joseph Romm outlines his objections to hydrogen-powered cars

In 2002, President Bush outlined a major $1.2 billion effort to help the Energy Department develop cars and trucks powered by hydrogen fuel cells. But Joseph Romm, a former DOE official under President Clinton and author of "The Hype About Hydrogen," says the White House may be putting too much emphasis on the technology. Romm explains some of the major barriers to hydrogen vehicles, including high costs and a lack of refueling stations and hydrogen supplies. Plus, he argues that hybrid gasoline-electric cars and biofuels are a better option in the next 20 years, especially when it comes to reducing greenhouse gases.