"It's been a year since Hurricane Katrina drowned New Orleans. Now returning residents wonder if the levees that failed in that storm will protect them. Living on Earth's Jeff Young reports on the levee repairs."
"For Mississippi and Alabama, Katrina was a historic natural disaster—a massive Category 5 hurricane that obliterated the coast. But for New Orleans it was a man-made catastrophe. By the time the storm reached here the winds and surge had weakened to within the design criteria of the levees meant to protect the city. Yet those levees failed on August 29th in the largest civil engineering disaster in American history."