A MASSACHUSETTS Institute of Technology study has concluded that hydrogen powered cars will not perform better than hybrid diesel-electric vehicles regarding energy use and greenhouse gas emissions until after 2020. It predicts that in the short term, "aggressive research on a hybrid car with a diesel engine will yield the most environmentally friendly results," because converting hydrocarbons into hydrogen for fuel uses energy and emits greenhouse gases. Ignoring this process "gives a misleading impression," said one researcher.

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