AP - More than half of all Americans live on or near the nation's coastal areas, and the number is growing, posing a challenge for emergency management officials in the event of hurricanes, tsunamis and other natural disasters, federal officials said Tuesday.{br}{br}View the Entire Article (http://us.rd.yahoo.com/dailynews/rss/science/*http://story.news.yahoo.com/news?tmpl=story2&u=/ap/20050301/ap_on_sc/coastal_population){br}