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Reports on studies which show that water was once abundant in the Sahara Desert region in Africa. Climate change; Migration of Saharans; Re-creation of the desert-building process on a computer by theoretical climatologist Martin Claussen and student Claudia Kubatzki; Axial tilt during the Holocene Optimum; Ways in which vegetation itself might procure the rainfall it needs.

Focuses on an exhibit at the Museum of Man in Paris, France which has photographs of Neolithic rock art from the Sahara Desert in Africa. Discovery of the rock art by French ethnologist Henri Lhote; How the art depicts the area as being verdant and teeming with life; Age of the rock art; Indications of the encroaching desert conditions.