Business Green: Electric and plug-in hybrid vehicles are just a few years away from mainstream adoption in some of the world’s largest cities, according to a study from McKinsey & Co which predicts they will account for up to 16 per cent of new car sales in New York City by the year 2015. The report, which surveyed 1,500 motorists in cities around the world, predicted New Yorkers could buy as many as 70,000 electric and plug-in hybrid vehicles in 2015. It similarly found that electric or plug-in …