Conspiracy Theory?

I saw this on The Facebook the other day, so I decided to steal it. The person from whom I’m stealing it didn’t post it as a public post, so I’m not linking to it. If you and she aren’t Facebook friends, the link won’t work. But here it is anyway:

Name an opinion you hold that is currently considered a conspiracy theory but that you think will be commonly accepted knowledge in the next 20 years. No debating, just let your comment stand as is.

Okay, I know you people. You’ll probably want to debate. If you do, be nice. Or what passes for nice around here.