New York City residents are the "greenest Americans"

Simon Jenkins | Opinion | The Guardian: "It is modern cities, not Stevens’ countryside, that are truly green, efficient, potentially healthy places. He should read the American environmentalist Ed Glaeser, who points out that the greenest Americans live in Manhattan. They walk a lot, share energy and live in easy reach of jobs, shops and services. “Those who move out to leafy, low-density suburbs,” he says, “leave a significantly deeper carbon footprint than Americans who live cheek by jowl.”"