Should we combine these tags? Or is it better they remain separate?
I think we should make enso the master tag and make both el-nino and la-nina synonyms to it. To do this we'll need to re-tag one of the el-nino questions to enso to create the tag and then we can synonym the other tags to it.
I can take care of this if the community agrees. I'll leave this here for a bit to see how the votes turn out, but I don't see any reason why it shouldn't get support.