Back in the late 80s/early 90s when they really started pushing this crap, I had a kind of epiphany where I saw all of earth history stretched out before me and there was this teeny, tiny little slice that was indicated as "recorded data." And since then I haven't really believed in it.
I know they can do things with ice cores and tree rings but those are still just very advanced guesses. And often times it takes more guesses to flesh those guesses out.
IOW, it only takes a little bit of thinking and the whole claim falls apart. It takes negative thinking, whatever that is, and a lot of it, to believe in.
In fact, I would go so far as to say it is a genuine cult, complete with apocalyptic prophesies of doom.
It's a manufactured cult like Menudo, Korn, or Limp Bizkit.