Changes happened as considerably away as the Andes, Alaska, and the Kenyan highlands, so the disturbance was evidentally of worldwide magnitude extended through the globe. eighty one. -------------------------------------------------- 3200 BC: Mesopotamia Tigris-EuphratresSharp reduction of Tigris-Euphratres streamflow at 5200 cal yrs BP also Iranian Plateau variations from humid to arid at exact same time.