If they're so good, why haven't electric cars taken off yet?

Electric vehicles have long been touted as the answer to many environmental problems from the potential to make a serious dent in emissions which harm human health and warm the planet - to reducing the demand on diminishing oil supplies. But after years of being talked up as a great alternative to the combustion engine, so far electric vehicles have yet to take hold in any market in the world, even as prices become more comparable with those of other new vehicles. So when might there be a tipping point for electric vehicles and what kind of infrastructure do countries need to make that happen? Chris Binns is the City of Sydney's manager of strategy and assets who, in 2009 made a plan to cut the city's vehicle fleet emissions by 20 percent in five years. That target's been exceeded by introducing electric cars and hybrid-diesel trucks and Chris Binns is in our Auckland studio. And there with him is the chief executive of Mighty River Power, Fraser Whineray who is leading the corporate charge for adoption of electric vehicles and charging stations