33rd century BC

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

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

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Events

• Unification of the first Ancient Egyptian state, marking the beginning of the Ancient Egyptian civilization.
• Ancient Egypt 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.
• Indus Valley civilization (also known as Harappan civilization or Sindu-Sarasvati civilization)