Sometimes I'm amazed how precisely they can predict airflows and temperatures in advance, from five up to to ten days, then again I'm surprised and frustrated how they could get it so wrong, as happened a few days ago. No freezing predicted, then weather changes suddenly, massive influx of cold polar air and 3 to 4 degrees Celsius below zero.
I think it's the wobble of the axis.
The permanent incline is unstable and probably affected by the constellation of the other planets in our solar system, of our moon and the solar winds of energy.
You don't need a Nibiru aka Planet-X for disaster or a total upside-down turn, a sudden Big Wobble of let's say 23 degrees into an upright position in relation to the plane of the solar system would be enough, imho, to create havoc and huge floods on earth's surface.
I can't see steady evolution in earth's history,
but more a chain of disasters, mankind included.
the angle between Earth's rotational axis and the normal to the plane of its orbit, obliquity, moves from 22.1 degrees to 24.5 degrees and back again on a 41,000-year cycle; currently, this angle is 23.44 degrees and is decreasing.