The widespread use of plug-in hybrid vehicles — which could be driven up to 40 miles on electric power alone — would significantly reduce greenhouse gas emissions in the United States without overloading the nation’s power grid, according to a new study. The upbeat news for plug-ins, seen by many as the next big step in environmentally friendly automotive technology, came with two caveats. Achieving the maximum air quality improvements would require a significant cut in the pollution produced by electric utilities. …
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