Nissan and GM push for electric cars despite slow sales

As Asia's carmakers continue to try to win a greater share of important markets like the US, some carmakers are using a different tack. Japan's Nissan and American rival GM are counting on electric cars like the Leaf to herald a new dawn for driving.

But last year electric cars sold under 18,000 units in the US - barely a 1% share of the world's biggest car market. Despite this, the industry still believes electric is the way forward, as the BBC's Caroline Hepker reports from Detroit.