Bush sells vision of hydrogen future

Using the national spotlight to sell a technology still foreign to most Americans, President Bush on Tuesday proposed a $1.2 billion program to help build the infrastructure needed to revolutionize the cars we drive. The goal is to replace the polluting internal combustion engine with battery-like fuel cells that run on nonpolluting hydrogen. But obstacles exist, and the long time frame has environmentalists worried that more immediate action will be ignored.


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