A new theory about Neanderthal extinction suggests climate changed played less of a role. The Washington Post reports of a new research in Nature that humans are once again the prime suspect. “Contrary to a popular hypothesis that Neanderthals succumbed to a suddenly colder climate, the new research indicates that southwestern Europe… enjoyed relatively mild weather” withe only a lot more rain.
The new work relies on a unique resource: a nearly 50-foot-long, oxygen-depleted sample of marine sediment drilled from Venezuela’s Cariaco Basin. Studies by Konrad Hughen of the Woods Hole Oceanographic Institution in Massachusetts have shown that layers of that core — undisturbed for millennia because the lack of oxygen kept worms and bugs from reaching them — can tell with uncanny resolution what the climate was like in the Northern Hemisphere.
Hughen, [Chronis Tzedakis of the University of Leeds,] and colleagues used the core to determine the climate in Gibraltar, where the most recent remnants of Neanderthal culture have been found. They focused on three time periods: 28,000 and 32,000 years ago (when, according to the best evidence, Neanderthals died out) and 24,000 years ago (when, according to one controversial estimate, the last Neanderthals died).
Climate was moderate during all three of those periods, they found, with extreme cold not arriving until about 21,000 years ago.
A gradual cooling of northern Europe may have played a role by pushing modern humans south, but from there either warfare or competition for resources must have been key, Hughen said.
“They survived 20,000 years of very unstable climate. Then when you add humans to the mix, they are gone within 10,000 years,” Hughen said. “You tell me what the most parsimonious explanation is.”