I agree that on the surface that it would appear to be several localized disaters, but you have to think about how many people come to those disaters from other parts of the country. if there are several large emergencies where do the recovery crews come from. After Katrina workers came from all over the country to repair power and other utilities, and after so long there are still workers on the gulf coast working to rebuild. if there are several disaters at once where would those people come from, and if it takes years to recover from 1 hurricane, or earthquake, or one attack what happens after several at once.