When will electric car sales exceed those of cars with engines? Poll results

2015 Nissan LeafCars that plug in to recharge, whether all-electric or plug-in hybrid, are a very small proportion of total U.S. vehicle sales today. And the same applies to their global sales, which are less than 1 percent of a total worldwide volume now headed toward 90 million vehicles a year. So today, the idea that electric-car sales might one day equal...