But, if the Ice Ages were cyclical, why is it so heavily poastulated that "our impact" might not help to even out the the extremes?

If our impact has caused massive pieces of ice shelves and glaciers to break off and drift into the oceans, perhaps these will cool things down and be a catalyst to move ocean currents. Maybe it's a good thing. Certainly, the evidence, as presented, indicates we should just hide in a fuckin cave, but I really can't see that happening.

Now, here's sommat that is gonna sound REALLY nuts. Large chunks of ice end up in the oceans. Almost the size of Orson Welles. The water levels rise and provide just enough pressure to push the tectonic plates apart 0.00001mm. This allows magma to rise in the 0.000001 wide cracks at the fault zones near the coasts. The magma (h)eats it's way up the crack and BOOM! Ya got Chile Con Carnage.

Sorry. But if I only have a wee bit of time left before Imagettin outta here, I'd like to go out with a joke.

I must see about cookin up a little chicken for supper.