I think Bill is dead right.
Life is a random process, subject to the laws of probability. Galveston was destroyed by hurricane in 1900, and the city razed to the ground. In the intervening century, on roughly a thirty year cycle, there have been hurricanes on the Gulf Coast, the Carribean, and the tornado belt around Kansas. A big one destroyed Darwin, Australia, in 1974. It's all time and probability, not necessarily global warming or greenhouse gases. These modern day issues will change the probabilities, certainly, but they won't be causative, as hurricanes have been around since the dawn of time.
What makes the natural disaster so traumatic is high population densities - an overbuilt environment. Lots of people, lots of tar and cement, inadequate protection for residents, flying metal debris, poor construction leading to flood damage and collapse. This applies to the levee bank near the shore line at New Orleans which was clearly not high enough.
Now the biggest problem facing New Orleans, Biloxi, Mobile and all the other badly affected towns in Louisiana and Mississippi is the flood damage, the grim possibility of waterborne diseases due to breakdowns in sanitation, and the looting. People in a desperate situation act with desperation, and we may yet see even more deaths as authorities move to uphold the rule of law. The fact that the poor and dispossessed are suffering most won't help, as these folk perceive they have little to lose.
It would be a terrible predicament if New Orleans was not rebuilt. I fervently hope that authorities start reconstruction immediately, but I see indecision already. Furthermore, with 20 gulf oil rigs now missing, and gas shortages in stark evidence, we can expect a sharp spike in the spot price which will have draconian repercussions across the US in the present climate of unrestrained energy demand from China.
This is a dreadful situation, showing clearly the random fury of nature, and pointing up that we should take nothing for granted. It shows that for all our efforts, we cannot see what lies ahead, and making provision for the unimaginable is not an option. It's a sublime pleasure to drive to the country on a sunny day, but it's possible life will change profoundly in the next twenty years and the Sunday drive will be solely the preserve of the wealthy.
As Bill says, too many people.......
Cheers,
Hugh