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In page Plug-in hybrid:
"According to a 2009 study by the National Academy of Science, "Electric vehicles and grid-dependent (plug-in) hybrid vehicles showed somewhat higher nonclimate damages than many other technologies."[4] Efficiency of plug-in hybrids is also impacted by the overall efficiency of electric power transmission. Transmission and distribution losses in the USA were estimated at 7.2% in 1995[5] and 6.5% in 2007.[6] By life cycle analysis of air pollution emissions, natural gas vehicles are currently the lowest emitter[citation needed].
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