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4th millennium BC

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(Redirected from 4000 BC)

(5th millennium BC4th millennium BC3rd millennium BC - other millennia)

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) [1] (http://www.news-about-space.org/story/2409.html) a number of indicators shows there were a global change in climate 5,200 years ago:

  • The climate was altered suddenly with severe impacts.
  • 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.
  • A man trapped in an Alpine glacier ("Oetzi") is frozen until his discovery in 1991.
  • Tree rings from Ireland and England show this was their driest period.
  • Ice core records showing the ratio of two oxygen isotopes retrieved from the ice fields atop Africas Mount Kilimanjaro, a proxy for atmospheric temperature at the time snow fell.
  • Major changes in plant pollen uncovered from lakebed cores in South America.
  • Record lowest levels of methane retrieved from ice cores from Greenland and Antarctica.
  • Beginning of desertification of Sahara (35th century BC). The shift by the Sahara Desert from a habitable region to a barren desert.

Significant persons

Inventions, discoveries, introductions

Cultural landmarks

Centuries

External references

de:4. Jahrtausend v. Chr. es:IV milenio adC fr:IVe millnaire av. J.-C. it:IV millennio AC lb:4. Joerdausend v. Chr. hu:I.e. 4. vezred nl:4000-3500 v. Chr. ja:紀元前4千年紀 pl:IV tysiąclecie p.n.e. pt:Quarto milnio a.C. ru:4 тысячелетие до н. э. ur:3000مقم

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