Ancient pollen and charcoal preserved deep in the rocks of the Nile Delta, suggests that ancient droughts and fires have occurred in the region, including the great drought 4200 years ago during the construction of the pyramids.
"Humanity has great experience of survival in a changing climate," — said the American researcher Christopher Bernhard. In addition, his research draws parallels between the evolution of the society dictated by climate variability at different scales, as for 10 years, and throughout the century.
The study, published in the July issue of the journal Geology, was made by two scientists, K. Bernhard of the University of Pennsylvania and the railroad Stanley of the Smithsonian Institution.
"Even the strong builders of the great pyramids could not withstand the changing climate. Problem of access to drinking water exists today as 4000 years ago, and a lot to do with climate change. " The researchers used samples of ancient pollen and charcoal, whose age has 7000 years to understand the mechanism of the critical events in the history of ancient Egypt.
Scientists have attempted to trace the pattern of drought with the accumulation of pollen. Also studied the presence and amount of charcoal, as previously noted, that the fires during droughts are directly related to the increase in coal.
It turned out that the vast reduction of pollen and charcoal increase observed four times over several thousand years. One of these events was the sudden drought in 4200 years ago, which led to serious social consequences, affecting all the Mediterranean cultures. If the response of vegetation to drought has been slower, the reduction in the volume of pollen is obvious. Those figures show the great droughts of 5 or 5500 years ago, when there was a unification of Upper and Lower Egypt, and 3,000 years ago, when the fallen kingdom of Ugarit, in Syria and Babylon famine.