Are Plug-in Hybrids Eco-friendly Green? | greenUPGRADER: "the journal Environmental Science & Technology published a study by researchers at Carnegie Mellon University that covers this very issue. The study took a look at the Green House Gas emissions (GHG) of Plug-in Hybrid Vehicles (PHEV’s) as compared to conventional vehicles (CVs) and charge-sustaining hybrids (HEVs)."
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