Rebuilding New Orleans can be done with green materials and with stronger materials such as insulated concrete forms that can withstand hurricane-force winds. Houses can use solar energy since the sun is a huge presence in New Orleans year-round and not just in the summer. The difficulty is that the city wants to preserve its history while at the same time it needs to move forward with a rebuilding effort.
Although construction and the use of materials will naturally have a negative impact on the environment this could be a opportunity to build a city that is self sustaining and green minded. Although this would require a new philosophy on the cities construction to avoid another disaster striking the city.