http://www.voanews.com/mediaassets/specialenglish/2009_10/Audio/Mp3/se-econ-urbanization-8sep09_0.Mp3 Cities Now Home to More Than Half of All People http://www.voanews.com/specialenglish/2009-10-09-voa3.cfm?renderforprint=1 2009-10-08 http://www.voanews.com/voanews_shared/images/widgetBarIcon.png