Brief history of the Sahara

Very very brief history:
[from the same website than "geography of the Sahara"]

Around 5000 BCE: Climatic changes, with more rainfall over the Saharan region. Domesticated livestock appears in Sahara, leading to nomadic pastoralism.

Around 4000 BCE: First traces of agriculture.

Around 0 CE: The climate of Sahara returns mainly to desert, rather similar to modern conditions.

3rd century: Camels are introduced in Sahara, taking the place of horses. This allows a great increase in trade, but also banditry.

7th century: Islam is introduced to Sahara, but the conversion process would take almost 4 centuries, involving sometimes mild missionary activities and sometimes brutal oppression.

16th century: Climatic changes involve increased precipitation.

18th century: This is a period of gradual decline in the precipitation, involving a process in which many regions become uninhabitable, leading up to the climatic and demographic conditions of modern times.

1922: Storms and floods destroy Tamanrasset in Algeria.

What I find particularly interesting is the introduction of the Camel...actually they are Dromedaries..the Camels are in Asia and have two humps...Like in Kazakhstan. Here they have one hump.