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In this Sept. 1, 2005, file photo, residents wait on a rooftop to be rescued from the floodwaters of Hurricane Katrina in New Orleans. It is the costliest natural disaster in U.S. history. But to many, especially to those in greater New Orleans, this catastrophe was anything but an act of God. (AP Photo/David J. Phillip, Pool, File) (责任编辑:) |

