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 decrease in solar activity. Glaciers expand, covering plants. Atmospheric temperatures fall to lowest levels.
- Sahara desert shifts from a habitable rejoin into a barren desert
Significant persons
- About 250 million people occupied planet