Shifting orbitals, ice age, pole reversal, galactic planar transit

Do we in fact have any good reason to think that the orbitals of planets do not change with time?  Have we sampled a large enough slice of history in our few decades of precision instrumentation to invalidate an hypothesis that ice ages may in fact be the result of enlarging distance from Sol?

Is it in our interest as a species in deed as guardian of terra to ignore this science?  We do in fact scan and study asteroids for near-earth collisions, govts planning how to deal with such a potentiality in our journey in this cosmic soup.

I say, spend a trillion dollars if it'll save our planet from ice age! Hey in fact burn down all the forests and burn all the fossil fuel cause th greenhouse is the only thing that'll keep us from getting caked in under a mile-thick (ten?) sheet of ice...

Id start by testing the basic assumptions, now deeply doubted, that orbitals are stable... remember they decided one solution to Jupiter-sized objects too near their parent star was orbital drift...

As we are now passing through the galactic plane there is sure to be a radical fuzz in the pull of nearby stars, it could cause a pole reversal, a wobble, who knows?

Where's a team of physicists when you need one?