Almost all carmakers have begun rolling out electric vehicles as their visions of future mobility take shape.Proponents forecast a revolution is under way that will change how people travel. But there are also skeptics, who point out that a practical electric car still hasn’t hit the market. At the moment, the batteries still represent about 40 percent of an electric car's price, and these batteries won't even last as long as the vehicle. Drive it! looks at how far electric cars have come as well as what can still be done to make conventional engines even more environmentally friendly.