Thank’s for the comment.
I fear “precession” has a bigger impact on our climat changes than estimated. This is an element on the long term, were humans have no experience.

Precession alone is powerful enough to drive a 20,000 year cycle wherein the Sahara alternates between a lush, wet land with three giant interconnected lakes and the desert we see today.

Precession, of course, is but one of three orbital eccentricities collectively known as Milankovitch cycles. These cycles are clearly the primary drivers of climate change on the scale of roughly 100,000 years, 40,000 years and 20,000 years.

But, many make the mistake of thinking about these cycles as being binary in nature. These cycles play out on a continuum and the interplay of these cycles is constantly altering our climate.

I hope that helped.

Click here for some more basic climate change science.

Has anybody ever thought about the “presession” [?? ed note] of the earth’s axis? It changes very slowly and must have an inpact on the earth’s global temperature in the very long term.

Sure enough! Thanks, David. It is fixed now.

-Chip