“And then the weather shifted” and all became a desert...
No. It got colder, there came less precipitation (rain) and the plants died.
The earth has been steadily cooling for the last 10,000 years, turning North Africa into a desert.
That’s why the global warmers are nut cases. If the temperatures went up up just a little bit, and the CO2 was up just a little bit, the Sahara could be restored to a lush equatorial jungle.
We need to get to very simple terms so that the numskulls understand: Heat is GOOD, cold is BAD, you Jane, me Tarzan.
Atmospheric CO2 is a ^Lagging Indicator^ of temperature change. When the Earth warms, the oceans release CO2, as it cools, the oceans sequester CO2.
That’s why the IPCC “normalized” the graphs of T and CO2 (ppm) by overlaying at the peaks and valleys and not by time.
Absolutely. You can't grow wheat when Kansas is under half a mile of glacier.