"The electric car is not dead," general motors North America president Mark Reuss insisted at the recent Automotive News World Congress in Detroit. He's right: automakers are introducing more battery-powered vehicles than ever before, a hopeful sign for this promising green technology. Fiat, Cadillac, Ford and Honda are all launching new electric models this year. Sales of the two mainstream plug-ins already on the market are up: GM's Chevy Volt sales tripled in 2012 over the year before, while the Nissan Leaf's rose modestly, by 1.5%.
Why is the auto industry on the defensive? Sales may be rising, but the Leaf...