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and the article talks about how shoes and book bindings would fall apart and thermometers not being able to measure the true heat in more modern times
Weather in Ancient Egypt There was a severe 200-year drought in North and East Africa around 2200 B.C. Hieroglyphics record that the annual Nile flood failed for 50 about years and many people died of famine. The disaster may have produced the collapse of the Old Kingdom and caused the period of chaos that followed. The power of the Pharaohs was based in part on their ability to predict the annual flooding of the Nile. Beatrix Midant-Reynes wrote: “Between 8500 and 5000 B.C. monsoon rains reached the northern Sahara, supporting the growth of savanna. As a consequence of annual precipitation of up to 100 mm, the area supported hunter-gatherer groups capable of covering vast distances. They brought with them ceramic technology and possibly domesticated cattle (for the question of the domestication of the Bos in Africa, see Marshall and Hildebrand 2002). Although we can only speculate on the relationships between the eastern Sahara and the Nile Valley during this time due to the lack of data from the Valley itself, it is clear that the region we currently identify as “desert” was not the large area of hyperaridity that exists today, nor was it a barrier between the Saharan nomadic populations and the inhabitants of the Valley. On the contrary, the two groups shared the hunter-gatherer way of life. [Source: Beatrix Midant-Reynes, Institut Français d'Archéologie Orientale, UCLA Encyclopedia of Egyptology, 2014, escholarship.org ] “In the sixth millennium B.C. the landscape changed. The gradually increasing seasonality of rains and the increasing rate of evaporation during the hot seasons rendered pools and lakes temporary, necessitating that people be highly mobile on the one hand and agglomerate in permanent water areas (e.g., oases and the Nile Valley) on the other (Riemer 2007): thus they adopted a radical new way of life based on livestock breeding."
The dynamics in the southern hemisphere are somewhat different. Mostly because there is a lot more ocean in the southern hemisphere. The ocean helps to slow the heating down.
If global warming is truly global in nature, wouldn't the southern hemisphere's summer be hotter every year than summer in the north?