National auto sales jumped 24 percent in March over the same period in 2009 – an increase attributed, at least in part, to tax incentives for purchasing environmentally friendly vehicles. Green – not only on in money, but in technology – was the unofficial color of the recent New York International Auto Show, which featured new hybrid vehicles, no-emission electric cars and even autos fueled by hydrogen. There were lines outside the “EV” (“Electric Vehicle”)  pavilion, where 10,000 attendees took electric cars for a spin during 10-day show.