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Dec. 14 -- Costs of plug-in hybrid electric cars are high and unlikely to decrease drastically in the near future, says a new report from the National Research Council. Subsidies in the tens to hundreds of billions of dollars will be needed if plug-ins are to achieve rapid penetration of the U.S. automotive market. Even with these investments, plug-in hybrid electric vehicles are not expected to significantly impact oil consumption or carbon emissions before 2030.
