A model by Claussen et al. (1999) suggested rapid desertification, associated with vegetation-atmosphere interactions following a cooling event, Bond event 4 [REF].
For example, Cremaschi (1998) describes evidence of rapid aridification in Tadrart Acacus of southwestern Libya, in the form of increased aeolian erosion, sand incursions and the collapse of the roofs of rock shelters [REF].