At the XXI UISPP World Congress in Poznan (Poland), the Art and Civilizations in the Sahara during Prehistoric Times commission is organizing Thematic Sessions 21A 'North African deep histories (c. 15,000–3000 BP): People, environment, and adaptation', held in honour of Ginette Aumassip and David Lubell, and 21B 'Protecting deep-time heritage in the Sahara, Nile Valley, and Mediterranean Africa: Sustainable management, capacity building, and cultural diplomacy'. These sessions explore the interactions between changing environments and the social, economic, and symbolic transformations of past societies in the Sahara and neighbouring regions, while bringing together archaeological, ecological, and rock-art research and addressing the preservation of this important heritage.