Cultural changes 1

 
This curve shows the differences (%) in modelled solar-output (luminosity) from 90.000-year average (from Perry & Hsü 2000). Warm-up periods in the Northern Hemisphere correspond to Humid phases in the Sahara, and European Glacial Ages correspond to SaharaAarids.

The three major Saharan Arid episodes are clearly visible (in blue).

The last two European Glaciations (Dryas II and III) match the hyperarid period beginning in the Sahara after the Aterian and going on till the beginning of the Holocene (conventionally established at 10.000 BP).

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