Business Green: One in five US vehicles could be electric or plug-in hybrid models by 2030, according to a report issued this week by Bloomberg New Energy Finance. The report, published as part of Bloomberg’s Energy Smart Technologies Insight Service, said that electric vehicle sales will rise to nine per cent of cars by 2020 before accelerating to 22 per cent in 20 years. A key driver will be fuel prices, which tend to push car owners quickly towards alternatives. However, electric vehicle sales are off to…