The first two comments seem to associate anthropogenic climate change with the changes in Louisiana's coastline. A more likely culprit is hydrologic mismanagement. The coastline was formed by waterways that periodically changed channels and dumped sediment in different areas. In relatively recent times cities on the existing waterways became politically influential enough for the federal government to build a series…
At some point, the river is going to go back to the way it's supposed to be, Army Corps of Engineers be damned.
c/f http://www.newyorker.com/magazine/1987/02/23/atchafalaya