The most tantalizing recent discovery, however, was made when scientists made a high-resolution study of dust deposition from Kajemarum Oasis in north-eastern Nigeria. The study conclusively revealed a pronounced shift in atmospheric circulation which occurred in and around 2150 BC. This data indicates that an abrupt, short-lived event of cold climate led to less rainfall and a reduction of water flow in a vast area extending from Tibet to Italy. This had catastrophic effects on such early state societies as the Egyptian Old Kingdom.
Long-term variations in Nile floods are beyond the perceptions of people. The Nile, today and during the prosperous times of the Old Kingdom, is regarded unquestionably as the source of life in Egypt. Therefore, the Nile can be considered as the force which destroyed the civilization that it had nurtured. Inconceivable as it might be, the Nile is a temperamental river. The volume of flood discharges varies wildly in episodes which range from decades to hundreds of years. Furthermore, there is the impact of freak years where the floods can be disastrously low or high.
The impact of a series of low floods, even if they occur over a few years, can cause distress, famine, plague and civil unrest in Egypt. Iin AD 967, a low flood caused a severe famine that left 600,000 people dead in and around Fustat, the capital of Egypt at that time. The famine lasted for two years and it was not until AD 971-2 that plentiful harvests returned. Once again, in 1201, low Nile floods followed by another low flood in 1202 caused a catastrophic famine.
This eyewitness account comes from Abdel-Latif Al-Baghdadi, a physician/scholar from Baghdad who was in Egypt from 1194 to AD 1200. He reported that people emigrated in crowds and that those who remained habitually ate human flesh, parents even ate their own children so people reverted to cannibalism at that time to survive. Graves were ransacked for food, assassinations and robbery reigned unchecked, and noblewomen begged to be bought as slaves. Al-Baghdadi's account is almost an exact copy of that recorded by Ankhtifi, more than 3000 years earlier.
All of Upper Egypt was dying of hunger, to such an extent that people reverted to eating their children. The entire country starved, like a starved grasshopper, with people going to the north and to the south in search of grain.
The lower Nile episode that devastated the Old Kingdom was, however, of greater magnitude and duration than that of 967 or AD 1201.