Sahara thousands years ago
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Between 9,000 and 6,000 years ago, the Sahara desert experienced wet and rainy conditions, forming a "Green Sahara". Evidence from sediments and cave paintings show rivers, lakes, and fertile land supported diverse wildlife and human civilizations. After 2,000 years, drier conditions returned and the desert formed. Computer models suggest human-driven climate change could cause future expansion of Sahara vegetation, but human activity in the region may prevent a full return to former "green" conditions.
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In this slideshow, you will learn about the definition, sources, types, examples, pollution effects, mitigation and control strategies, UN policy, and global statistics of plastic waste and plastic waste management. Biogas Production and its Application in the World
Biogas Production and its Application in the World24msbt36
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Biogas Production and its Application: Process and the different microorganisms usedfuture research in optimizing biomethane production.
H2Ohio: Navigating the Waters of Opportunity and Challenge
H2Ohio: Navigating the Waters of Opportunity and ChallengeNational Association of Conservation Districts
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Sahara thousands years ago
- 1. WHAT DID THE SAHARA LOOK LIKE SIX TO TEN THOUSAND YEARS AGO ? Wendy Bintner Sahara Irrigation Mega-Engineering Project 11
- 2. SAHARA TODAY Description of Sahara Today 2 Sahara : sand, sun, scorcher temperatures
- 3. PLAN Green Sahara How do we know Whats happened ? A new Green Sahara soon ? 3
- 4. GREEN SAHARA What ? Wet and rainy conditions in the northern Africa When ? 9 000 and 6 000 years ago How ? Climate change 4 Green Sahara
- 5. GREEN SAHARA Water Rivers Lakes Life Fertile conditions Animals Humans Humans 55
- 6. GREEN SAHARA Crocodiles, elephants, giraffe, hippos, antelopes, fish, Civilization used rivers : boat, raft, fishing (hook, harpoon, line, ) Civilization learned a lot : cooking (porridge, soup, ), pottery 6
- 7. HOW DO WE KNOW ? Sediment : evidence of water Cave painting : evidence of civilization and animals 7 How Earth Made Us - Sahara
- 8. WHATS HAPPENED After 2 thousands years, the drier conditions that prevailed prior to the Green Sahara returned. Desertification advanced, and the Sahara desert formed (or re-formed). Arid conditions have continued through to the present day. 88
- 9. A NEW GREEN SAHARA SOON ? Computer model simulations : an expansion of the vegetation cover in the Sahara Desert ( human-driven climate change leads to aggressive global warming) Sahara wont actually become greener than it is today, as the simulations do not account for the influence of human activity in this area. Science Daily 9
- 10. Thanks for listening. Do you have any questions ? The best engineering school 10 wendy.bintner(at)etu.emse.fr