Humans nearly wiped out 70,000 years ago, study says

[Buffmaster]

Humans nearly wiped out 70,000 years ago, study say




WASHINGTON (AP) -- Human beings may have had a brush with extinction 70,000 years ago, an extensive genetic study suggests.


Geneticist Spencer Wells, here meeting an African village elder, says the study tells "truly an epic drama."

The human population at that time was reduced to small isolated groups in Africa, apparently because of drought, according to an analysis released Thursday.

The report notes that a separate study by researchers at Stanford University estimated that the number of early humans may have shrunk as low as 2,000 before numbers began to expand again in the early Stone Age.

"This study illustrates the extraordinary power of genetics to reveal insights into some of the key events in our species' history," said Spencer Wells, National Geographic Society explorer in residence.

"Tiny bands of early humans, forced apart by harsh environmental conditions, coming back from the brink to reunite and populate the world. Truly an epic drama, written in our DNA."

Wells is director of the Genographic Project, launched in 2005 to study anthropology using genetics. The report was published in the American Journal of Human Genetics.

Studies using mitochondrial DNA, which is passed down through mothers, have traced modern humans to a single "mitochondrial Eve," who lived in Africa about 200,000 years ago.

The migrations of humans out of Africa to populate the rest of the world appear to have begun about 60,000 years ago, but little has been known about humans between Eve and that dispersal.

The new study looks at the mitochondrial DNA of the Khoi and San people in South Africa, who appear to have diverged from other people between 90,000 and 150,000 years ago.

The researchers led by Doron Behar of Rambam Medical Center in Haifa, Israel, and Saharon Rosset of IBM T.J. Watson Research Center in Yorktown Heights, New York, and Tel Aviv University concluded that humans separated into small populations before the Stone Age, when they came back together and began to increase in numbers and spread to other areas.

Eastern Africa experienced a series of severe droughts between 135,000 and 90,000 years ago, and researchers said this climatological shift may have contributed to the population changes, dividing into small, isolated groups that developed independently.

Paleontologist Meave Leakey, a Genographic adviser, asked, "Who would have thought that as recently as 70,000 years ago, extremes of climate had reduced our population to such small numbers that we were on the very edge of extinction?"

Today, more than 6.6 billion people inhabit the globe, according to the U.S. Census Bureau.

The research was funded by the National Geographic Society, IBM, the Waitt Family Foundation, the Seaver Family Foundation, Family Tree DNA and Arizona Research Labs.

[AYHJA]

A drought pushed people into...Africa..? Damn, shit was mad dry then, lol...I wonder what the cause was, and when we're do for the next one...

[richardmensura]

I wonder what saved the last 2000 humans from becoming extinct? Some kind of event...or intervention?

[marioz988]

An American future reader - a lady - known but forgot her name was on the news years ago said that by 2050 maybe humans will be forced to live under covered environments with their cattles, services etc .. due to the harsh hot climate that will come.
Few degrees up and the whole medium we know now will be different.
Africa again or North countries could be our future refuge ?
maybe !! :think: