Fumes.
Right. If you live anywhere near the Gulf the wind is going to be blowing nasty and worst-case toxic fumes in your direction. If you live in Florida it is going to be terrible and possibly even uninhabitable. Yes we are talking refugees in large numbers if this oil leak continues.
I was already concerned with the effect of global warming on real estate prices when it suddenly sinks in that a lot of land is going to be underwater. Seriously, would YOU buy a house anywhere in a coastal area that has an altitude lower than maybe 30 feet? One of these days everyone is going to realize what that means – all at the same time.
But now, an entire region is going to be covered in (best-case) terrible stink.