Yahoo! Green: Fresh off the $1.75 PATH tubes from Manhattan, I am standing on a pleasant residential street lined with brownstones in downtown Hoboken, New Jersey with the boyish Ian Sacs, head of the city’s transportation and parking bureau. In front of me is a Toyota Prius, just like any other except for the fact that it is parked in a green-lined space … and just about anyone in Hoboken could drive it. Welcome to Corner Cars, Hoboken’s municipal car-sharing program, undertaken in …