The Expiring Kalahari
摘要
Drought cycles recurrent phenomenon since Livingstone’s day. Historic droughts. Drying of waterholes, rivers and streams in nineteenth century. Lake Ngami fluctuations. Hippo and silting of Okavango Delta. Makgadikgadi salt pans an ancient vast lake. The Savuti another fluctuating watercourse. Mababe flats alternate between marsh and dry plain. Resumption of flow not due to rainfall. Fall of South African water table. Temperature rise in Botswana. Removal of vegetation cover, overstocking and overuse causes of increasing dryness.