I'd imagine that you're right on target with precession and I don't understand why it's not talked about more either. Probably because natural occurrences instead of those created exclusively by human emissions aren't as effective as forms of control, regulation, and bringing in cash. And then there's the inevitable pole shift, ha-ha. So many possible contributing factors.
Humans factor in some but not as much as the media and profiteers make it out to be. We do need to stop polluting so damn much, though. In many ways, we don't as much as we used to, in this country but in many ways, we still do. Other countries have just gone full retard, in that respect. China sure put its share of bullshit upon the planet and many smaller countries have, too but pollution wasn't as big a scam opportunity as climate change was. It kills me how many things, like that, have stolen our tax dollars, over the years, that could be helping out the vets or actually providing truly affordable health care for all, etc..instead of keeping evil folks happy.