Combination Erosion News Today

David talking about where new orleans started in terms of being on the natural levee. we think about the city obviously not physically moving towards shore -- towards the shore, but the shore encroaching in towards the city. how much of these wetlands have we been losing and why? >> thats the tragedy of the thing. were losing 25 to 30 square miles of wetlands a year here, which basically during the time were talking, maybe an area the size of a football field may have disappeared. where thats co...