International

Oldest human relative walked upright 7 mn years ago: study

AFP

The earliest known human ancestor walked on two feet as well as climbing through trees around seven million years ago, scientists said Wednesday after studying three limb bones.

When the skull of Sahelanthropus tchadensis was discovered in Chad in 2001, it pushed back the age of the oldest known representative species of humanity by a million years.

Nicknamed “Toumai”, the nearly complete cranium was thought to indicate that the species walked on two feet because of the position of its vertebral column and other factors.

However the subject triggered fierce debate among scientists, partly due to the scarcity and quality of the available bones, with some even claiming that Toumai was not a human relative but just an ancient ape.

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In a study published in the Nature journal on Wednesday, a team of researchers exhaustively analysed a thigh bone and two forearm bones found at the same site as the Toumai skull.

“The skull tells us that Sahelanthropus is part of the human lineage,” said paleoanthropologist Franck Guy, one of the authors of the study.

The new research on the limb bones demonstrates that walking on two feet was its “preferred mode of getting around, depending on the situation,” he told a press conference.

But they also sometimes moved through the trees, he added.

– ‘Not a magical trait’ –

The leg and arm bones were found alongside thousands of other fossils in 2001, and the researchers were not able to confirm that they belonged to the same individual as the Toumai skull.

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After years of testing and measuring the bones, they identified 23 characteristics which were then compared to fossils from great apes as well as hominins — which are species more closely related to humans than chimpanzees.

They concluded that “these characteristics are much closer to what would be seen in a hominin than any other primate,” the study’s lead author Guillaume Daver told the press conference.

For example, the forearm bones did not show evidence that the Sahelanthropus leaned on the back of its hands, as is done by gorillas and chimpanzees.

The Sahelanthropus lived in an area with a combination of forests, palm groves and tropical savannahs, meaning that being able to both walk and climb through trees would have been an advantage.

There have been previous suggestions that it was the ability to walk on two feet that drove humans to evolve separately from chimpanzees, putting us on the path to where we are today.

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However the researchers emphasised that what made Sahelanthropus human was its ability to adapt to its environment.

“Bipedalism (walking on two legs) is not a magical trait that strictly defines humanity,” paleontologist Jean-Renaud Boisserie told the press conference.

“It is a characteristic that we find at the present time in all the representatives of humanity.”

– Our ‘bushy’ family tree –

Paleoanthropologist Antoine Balzeau of France’s National Museum of Natural History said the “extremely substantial” study gives “a more complete image of Toumai and therefore of the first humans”.

It also bolstered the theory that the human family tree is “bushy”, and was not like the “simplistic image of humans who follow one another, with abilities that improve over time,” Balzeau, who was not involved in the research, told AFP.

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Daniel Lieberman, a professor of human evolutionary biology at Harvard University, said in a linked paper in Nature that the study’s “authors have squeezed as much information as possible from the fossil data”.

But he added that the research will not offer “full resolution” of the debate.

Milford Wolpoff, a paleoanthropologist at the US University of Michigan cast doubt on whether Toumai is a hominin, telling AFP that “extraordinary claims require extraordinary evidence”.

Wednesday’s study was carried out by researchers from the PALEVOPRIM paleontology institute, a collaboration between France’s CNRS research centre and Poitiers University, as well as scientists in Chad.

Guy said the team hopes to continue its research in Chad next year — “security permitting”.

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Chadian paleontologist Clarisse Nekoulnang said the team was “trying to find sites older than that of Toumai”.

International

Japan reopens Kashiwazaki-Kariwa Plant despite public concerns

La centrale nucléaire japonaise de Kashiwazaki-Kariwa, la plus grande au monde, a repris ses activités mercredi pour la première fois depuis la catastrophe de Fukushima en 2011, malgré les inquiétudes persistantes d’une partie de la population.

La remise en service a eu lieu à 19h02 heure locale (10h02 GMT), a indiqué à l’AFP Tatsuya Matoba, porte-parole de la compagnie Tokyo Electric Power (Tepco).

Le gouverneur de la préfecture de Niigata, où se situe la centrale, avait donné son feu vert à la reprise le mois dernier, en dépit d’une opinion publique divisée. Selon une enquête menée en septembre par la préfecture elle-même, 60 % des habitants se déclaraient opposés au redémarrage, contre 37 % favorables.

Mardi, plusieurs dizaines de manifestants ont bravé le froid et la neige pour protester près de l’entrée du site, sur les rives de la mer du Japon.

« L’électricité de Tokyo est produite à Kashiwazaki. Pourquoi seuls les habitants d’ici devraient-ils être exposés au danger ? Cela n’a aucun sens », a déclaré à l’AFP Yumiko Abe, une riveraine de 73 ans.

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La centrale de Kashiwazaki-Kariwa avait été mise à l’arrêt lorsque le Japon a fermé l’ensemble de ses réacteurs nucléaires à la suite du triple désastre de mars 2011 — un séisme, un tsunami et un accident nucléaire — survenu à Fukushima.

International

Markets rise as Trump halts Europe tariffs and floats Greenland agreement framework

U.S. President Donald Trump on Wednesday lifted his threat to impose new tariffs on several European countries and said he had outlined the framework of a future agreement on Greenland during a meeting in Davos with NATO Secretary General Mark Rutte.

“Based on this understanding, I will not impose the tariffs that were scheduled to take effect on February 1,” Trump wrote on his social media platform Truth Social, without providing details about the proposed “framework.”

The announcement boosted financial markets. Wall Street, which had been trading slightly higher, extended its gains following Trump’s message, while the U.S. dollar strengthened against the euro.

Trump has repeatedly insisted that Greenland, rich in mineral resources, is ‘vital’ to the security of the United States and NATO, particularly as Arctic ice melts and global powers compete for strategic advantage in the region amid rising tensions with China and Russia.

Last week, the U.S. president threatened to impose tariffs of up to 25% on eight European countries for supporting Denmark and sending a military exploratory mission to Greenland. All of the targeted countries are NATO members, including the United Kingdom, Germany, and France, Europe’s largest economies.

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Trump said on Wednesday that additional discussions are underway regarding the “Golden Dome” missile defense system, specifically in connection with Greenland.

He assigned Vice President JD Vance, Secretary of State Marco Rubio, and special envoy Steve Witkoff to lead the negotiations.

Hours before his post, Trump ruled out the use of force to seize Greenland for the first time, but demanded “immediate negotiations” for its acquisition, reiterating his view that only the United States can guarantee the security of the Arctic island.

International

Venezuela’s interim president predicts 37% increase in revenues for 2026

Venezuela’s interim president, Delcy Rodríguez, said Wednesday that the country’s revenues are expected to increase by about 37% in 2026, in a statement made during a session of the Federal Government Council at the Miraflores Presidential Palace in Caracas.

Rodríguez said the projected rise in foreign currency income comes as agreements on Venezuelan oil sales with the United States are being implemented, including deals in which Washington will trade Venezuelan crude and manage the proceeds before transferring funds to Caracas.

“This year, revenues expressed in foreign currency will increase by 37%,” Rodríguez declared, according to EFE. She noted that the increase will also benefit regional governments and local authorities. “You will have more resources for your management, which I know you need,” she added.

Rodríguez said the distribution formula for revenues will remain the same as in 2025: 53% for communes, 29% for state governments, 15% for municipalities, and 3% for institutional strengthening. She also said the government would intervene to “correct imbalances” in how funds are allocated, particularly among some municipal and regional authorities.

The announcement follows reporting that Venezuela received at least $300 million from oil revenues tied to a U.S.–Venezuela deal that could involve up to 50 million barrels of crude. Washington officials have said the interim government met U.S. requirements under the agreement.