A new research has found that human beings migrated out of Africa due to a major climate change about 60,000 years ago. The research was conducted by geoscientists from the University of Arizona.
Researchers found that humans migrated from Africa into Eurasia between 70,000 and 55,000 years ago. The climate shifted from wet to very dry was the reason for people to migrate to Eurasia by crossing the Horn of Africa and the Middle East.
Researchers said that climate in the Horn of Africa changed from a wet phase named “Green Sahara” to even drier than the area is now.
They analyzed the core of ocean sediment taken in the western end of the Gulf of Aden to trace the Horn of previous 2,00,000 years the climate of Africa.
Jessica Tierney, lead author, who studies the climate change at the University of Arizona said, “We really wanted to figure out if we could find a way to reconstruct the climate at this time using geologic archives.” “It seemed like the migration lines up with this really dry and cold time,” she added.
The team of researchers also studied the ancient leaf wax on the core, whose chemical composition can change with ocean temperature. This study produced the crucial data on the ancient rainfall variations in the area. These wax compounds are effectively preserved in these cores, so that they are easy to isolate and analyze.
At the rime of human migration from Africa, important facts about the climate of northeast Africa was also revealed from the study funded by the National Science Foundation and the David and Lucie Packard foundation