Jim Motavalli, an eco-author and green transportation expert, states that we are headed for “peak oil” — when oil demand soars above oil supply. His new book, High Voltage, due this fall, examines electric vehicles and how they will change our oil dependency. Motavalli cites the expanding lineup of hybrid, plug-in hybrid and electric cars as a major accomplishment in green engineering. He also lists the hydrogen fuel cell car, expected to be on the market in 2015, as a paramount in eco-technology. “It may take 30 years for the internal-combustion engine to disappear from the road,” Motavalli says. “It’s not going to be overnight that we transition, plus [the electric engine is] very much in its infancy right now. I think we’ll see a lot of improvement in the gas car, say as far as 80 miles a gallon, so that will remain a competitive technology.”