BBC: Teams from three continents have set off from the Place des Nations in Geneva with their electric cars on the longest and greenest race of all time, called the Zero Race. The cars will cross to Moscow and Shanghai and then travel by ship to Vancouver. From there they will continue along the west coast of North America all the way to Cancun, Mexico. In December, the vehicles will be shipped again to Portugal, and travel over southwest Europe to complete the final leg of the …