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4th millennium BC

The 4th millennium BC saw major changes in human culture. It marked the beginning of the Bronze Age and of writing.

The city states of Sumer and the kingdom of Egypt were established and grew to prominence. Agriculture spread widely across Eurasia. World population in the course of the millennium doubled, approximately from 7 to 14 million people in the area surrounding them.

Contents


Events

Cultures

Environmental changes

Based on studies by glaciologist Lonnie Thompson, professor at Ohio State University and researcher with the Byrd Polar Research Center, a number of indicators shows there was a global change in climate 5,200 years ago, probably due to a drop in solar energy output as hypothesized by Ohio State University.[1]

  • Plants buried in the Quelccaya Ice Cap in the Peruvian Andes demonstrate the climate had shifted suddenly and severely to capture the plants and preserve them until now.[2]
  • A man trapped in an Alpine glacier (" tzi the Iceman") is frozen until his discovery in 1991.[3]
  • Tree rings from Ireland and England show this was their driest period.[3]
  • Ice core records showing the ratio of two oxygen isotopes retrieved from the ice fields atop Africa's Mount Kilimanjaro, a proxy for atmospheric temperature at the time snow fell.[3]
  • Major changes in plant pollen uncovered from lakebed cores in South America.[3]
  • Record lowest levels of methane retrieved from ice cores from Greenland and Antarctica.[3]
  • End of the Neolithic Subpluvial, start of desertification of Sahara (35th century BC). North Africa shifts from a habitable region to a barren desert.[3]

Significant persons

Inventions, discoveries, introductions

Sumerian Cuneiform Script
Sumerian Cuneiform Script

Religion

Calendars and chronology

Centuries

References

  1. a b c d e f
  2. Federico Lara Peinado, Universidad Complutense de Madrid: "La Civilizaci n Suemria.". Historia 16, 1999.
  3. Roberts, J: "History of the World.". Penguin, 1994.
  4. See horoscope number 1 in
  5. Arun K. Bansal's research published in Outlook India, September 13, 2004.
  6. Annals of the World, as well as the above sources






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