If American motorists would use rechargeable “plug-in” hybrid-electric vehicles in large numbers, the United States could see a significant drop in greenhouse gas emissions by the middle of the century, says a study.

Researchers estimated that with a market share of about 60 per cent or more plug-ins, the vehicles could help reduce approximately 450 million metric tons in greenhouse gas emissions a year by 2050. The reductions would be the equivalent of removing 82 million passenger cars, or about one-third of the cars currently on US highways. The study was conducted by the Electric Power Research Institute, a not-for-profit research group, and the Natural Resources Defense Council, an environmental group. more on hybrid cars

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