New Orleans has been subsiding since the day it was founded. Geologists and engineers have known this for a long, long time. Most of the city is below sea level, and has been for a long time. Water flows downhill. Levees of any kind are only a temporary fix. Is it worth the money to build the levees higher, or the buildings higher, and maintain them forever? That is the question, because the flooding will happen again, and again, and again, global warming, or Al Gore, Democrats or Republicans, or not.
Man has tried to thwart nature, by building levees and straightening the Mississippi. Somehow, man always gets it wrong and nature does what it, (she) wants to. Rivers go where they want to go, (downhill, and to the lowest point), and our climate will change, as it always has. (Build your beachfront homes on stilts). Earthquakes will happen, (don't build on known active fault lines), and hurricanes, local flooding and tornadoes will always happen.
(satellite photo of the Mississippi River Delta, showing how it's sediments are spread farther out into the Gulf of Mexico, letting New Orleans subside, sink, and flood.........Peter's opinion)
And I love New Orleans, its history, music, cuisine, culture.....