By Rick Zhang For a printable version of the article, click here According to the United Nations, the world population living in urban areas will double by 2050, with most of the urbanization occurring in the developing regions of Asia and Africa. Meanwhile, private car ownership continues to skyrocket, causing traffic congestion and pollution in […]

By Sven Beiker For a printable version of this article, click here. In the United States, light duty vehicles travel about three trillion passenger miles every year. That means that annually we collectively travel a distance more than thirty thousand times the distance from the Earth to the Sun! While we appreciate the convenience of […]