33rd century BC
(34th century BC – 33rd century BC – 32nd century BC – other centuries)
(5th millennium BC – 4th millennium BC – 3rd millennium BC)
Events
- 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.
Significant persons
- About 250 million people occupied planet
Inventions, discoveries, introductions
Categories: Centuries | 33rd century BC | 4th millennium BC