33rd century BC

(34th century BC - 33rd century BC - 32nd century BC - other centuries)

(5th millennium BC - 4th millennium BC - 3rd millennium BC)

---

Events

• Ancient Egyptians begin using clay, bone & ivory tags to label boxes. This is possibly the oldest writing in existence.
• Major climate shift possibly due to shift in solar activity. Glaciers expand, covering plants. Atmospheric temperatures fall to lowest levels.
• Sahara changes from a habitable region into a barren desert.