Neighborhood traits

But, worlds already have traits, mostly. Seasons affect each world differently. Brindleton Bay, Sulani, San Myshuno, Strangerville, Granite Falls and Selvadorado all have a unique, distinct world trait.

Sulani plays with the pollution theme in one neighborhood. If you have City Living and Island Living you can equip a lot with grody, earthquake and volcano, that makes for interesting play. Also there is another gremlin like trait that breaks everything in the house.

@LeGardePourpre I do like the water and air pollution notion.
I think a SimCity esque disaster pack with a superhero and super villain would be cool. I miss the Aliens in TS3, they could call down meteor strikes. TS4 aliens don't have that ability.