Perfect storms

Even if the scientists who warn that climate change will mean larger hurricanes in greater numbers are more correct than they think they are, it doesn't necessarily mean every hurricane season will bring with it a perfect storm. Katrina was a nightmare, but by the time it settled over New Orleans, it was a Category 3/4 storm. Conversely, Dean is a monster, but has thusfar saved much of its wrath for lightly populated areas.

Eventually, though, a gigantic storm will make landfall at full power over a major city, to horrifying effect. And it should be an obvious imperative, as humans, not to do things that hasten a disaster like tht.