Why did the Neanderthals die out?

A major conference in London this week will reveal the results of five years' research on why Homo sapiens emerged triumphant in the survival battle of the humans

The Guardian, The Observer, Robin McKie, science editor, Sunday 2 June 2013

New research has revealed that Neanderthals died out within a few thousand
years of the appearance of Homo sapiens. Photograph: BBC

The puzzle is one of the greatest surrounding our species. On a planet that bristled with different types of human being, including Neanderthals and the Hobbit-like folk of Flores, only one is left today: Homo sapiens.

Our current solo status on Earth is therefore an evolutionary oddity – though it is not clear when our species became Earth's only masters, nor is it clear why we survived when all other versions of humanity died out. Did we kill off our competitors, or were the others just poorly adapted and unable to react to the extreme climatic fluctuations that then beset the planet?

These key issues are to be tackled this week at a major conference at the British Museum, in London, called When Europe was covered by ice and ash. At the meeting scientists will reveal results from a five-year research programme using modern dating techniques to answer these puzzles.

In particular, researchers have focused on the Neanderthals, a species very close in physique and brain size to modern humans. They once dominated Europe, but disappeared after modern humans emerged from our African homeland around 60,000 years ago. The question is: why?

"A major problem in understanding what happened when modern humans appeared in Europe has concerned the dates for our arrival," said Professor Chris Stringer, of the Natural History Museum, London. "It was once thought we appeared in Europe around 35,000 years ago and that we coexisted with Neanderthals for thousands of years after that. They may have hung on in pockets – including caves in Gibraltar – until 28,000 years ago, it was believed."

In other words, there was a long, gradual takeover by modern humans – an idea that is likely to be demolished at this week's conference, Stringer said. Results from the five-year research programme, Reset (Response of humans to abrupt environmental transitions), will show that modern humans arrived much earlier than previously estimated and that Neanderthals expired earlier than we thought. Careful dating of finds across Europe suggest Homo sapiens could have reached Europe 45,000 years ago. Five thousand years later, Neanderthals had largely disappeared.

"Previous research on Neanderthal sites which suggested that they were more recent than 40,000 years old appears to be wrong," said Stringer. "That is a key finding that will be discussed at the conference."

Using radiocarbon technology to date remains that are 40,000 years old has always been tricky. Radioactive carbon decays relatively quickly and after 40,000 years there will only be a tiny amount left in a sample to measure. The tiniest piece of contaminant can then ruin dating efforts.

However, scientists have set out to get round these problems. At Oxford University, scientists led by Tom Higham have developed new methods to remove contamination and have been able to make much more precise radiocarbon dating for this period. In addition, Reset researchers have used evidence of a devastating eruption of the Campi Flegrei volcano west of Naples 39,000 years ago.

Recent studies have shown this eruption was much more destructive than previously recognised. More than 60 cubic miles of ash were blasted into the atmosphere and covered a vast area of eastern Europe, North Africa and western Asia. This layer gives scientists a precise means of dating for this period and, combined with the new radiocarbon dating, shows there seem to be no Neanderthal sites anywhere in Europe 39,000 years ago, a date 10,000 years earlier than previous estimates. It is a significant shift in our thinking about our nearest evolutionary cousins.

Some researchers have even suggested that Campi Flegrei – the biggest volcanic eruption in Europe for more than 200,000 years – would have had a catastrophic impact. Vast plumes of ash would have blotted out the sun for months, or possibly years, and caused temperatures to plummet. Sulphur dioxide, fluoride and chloride emissions would have generated intense falls of acid rain. Neanderthals may simply have shivered and choked to death.

The Campi Flegrei eruption not only gives us a date for the Neanderthals' disappearance, it may provide us with the cause of their extinction, though Stringer sounds a note of caution.

"Some researchers believe there is a link between the eruption and the Neanderthals' disappearance. But I doubt it," he said. "From the new radiocarbon dating and the work carried out by Reset scientists, it looks as if the Neanderthals had probably already vanished. A few may still have been hanging around, of course, and Campi Flegrei may have delivered the coup de grace. But it would be wrong to think the eruption was the main cause of the Neanderthals' demise."

So what did kill off the Neanderthals? Given the speed at which they seem to have disappeared from the planet after modern humans spread out of Africa, it is likely that Homo sapiens played a critical role in their demise. That does not mean we chased them down and killed them – an unlikely scenario given their muscular physiques. However, we may have been more successful at competing for resources, as recent research has suggested.

Eiluned Pearce and Robin Dunbar of Oxford University recently worked with Stringer and compared the skulls of 32 Homo sapiens and 13 Neanderthals, finding the latter had eye sockets that were significantly larger. These larger eyes were an adaptation to the long, dark nights and winters of Europe, they concluded, and would have required much larger visual processing areas in Neanderthal skulls.

By contrast, modern humans, from sunny Africa, had no need for this adaptation and instead they evolved frontal lobes, which are associated with high-level processing. "More of the Neanderthal brain appears to have been dedicated to vision and body control, leaving less brain to deal with other functions like social networking," Pearce told BBC News.

This point is stressed by Stringer. He said: "Neanderthal brains were as big as modern humans' but the former had bigger bodies. More of their brain cells would have been needed to control these larger bodies, on top of the added bits of cortex needed for their enhanced vision. That means they had less brain power available to them compared with modern humans."

Thus our ancestors possessed a fair bit of enhanced cerebral prowess, even though their brains were no bigger than Neanderthals'. How they used that extra brain power is a little trickier to assess, though most scientists believe it maintained complex, extended social networks. Developing an ability to speak complex language would have been a direct outcome, for example.

Having extended networks of clans would have been a considerable advantage in Europe, which was then descending into another ice age. When times got hard for one group, help could be sought from another. Neanderthals would have less backup. This point is supported by studies of the flints used for Neanderthal tools. These are rarely found more than 30 miles from their source. By contrast, modern humans were setting up operations that saw implements transported 200 miles.

Cultural life became increasingly important for humans. Research by Tanya Smith of Harvard University recently revealed that modern human childhoods became longer than those of Neanderthals. By studying the teeth of Neanderthal children, she found they grew much more quickly than modern human children. The growth of teeth is linked to overall development and shows Neanderthals must have had a much reduced opportunity to learn from their parents and clan members.

"We moved from a primitive 'live fast and die young' strategy to a 'live slow and grow old' strategy and that has helped make humans one of the most successful organisms on the planet," said Smith. Thus Neanderthals – who already lived in sparse, small populations across Europe – were fundamentally ill-equipped to deal with the newcomers who had arrived from Africa.

"There may not have been a single cause of Neanderthal extinction," said Stringer. "They may have disappeared in different regions for different reasons, but the background cause is clear. They didn't have the numbers."

THE TWO FACES OF MAN

Neanderthals and modern humans are believed to have evolved from a common ancestor, Homo heidelbergensis, about 400,000 years ago. Homo heidelbergensis then existed in Europe, Africa and Asia.

It is thought the species evolved into Neanderthals in Europe and into Homo sapiens in Africa. Neanderthals had more muscle and were broader than modern humans, an adaptation to Europe's colder environment. Homo sapiens was better able to lose body heat, a key response to the conditions in Africa. Homo sapiens began to evolve artistic skills and a capacity for symbolic thinking.

About 60,000 years ago, modern humans migrated from Africa into Asia and Europe. It is not known when they first met Neanderthals, but at least once, in one location, there was a positive outcome - for genetic evidence suggests some interbreeding took place between the species. As a result, tiny fragments of Neanderthal DNA live on in our genes.

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"A SUMMARY FOR RUSSIA - part 1/2" – May 16/17, 2013 (Kryon Channelling by Lee Caroll)

"The Timing of Creation"– Aug  12, 2012 (Kryon Channelling by Lee Caroll) - (Text version)

“…. The First Look

About 200,000 years ago is when it literally began. The concept of the "divine seeding" of planet Earth happened at that point, and the fields metaphorically started to be ploughed. There is an issue and we're going to call it the way species work with Gaia. This is something that happened simultaneously with the grid creation of Gaia. For now we give you something that no one has thought about. When we speak of the grids of the planet, you make an assumption that these grids always existed on the planet. For the planet is old and you might say, "Well the grids have always been there." But I'm here to tell you that only one was always there, and that's the magnetic grid. But it was spiritually void. That is to say, it only had that which was created from the Earth's core movement. Today, when we talk about the grids of the planet, our conversation involves the consciousness of humanity, which is imbued upon the magnetic grid. We also tell you about the Crystalline Grid and about the Grid of Gaia consciousness. Both of these react to Human compassion.

Now, here is the puzzle: If you don't have divine Human consciousness, then what about the grids? Do they exist without the Human Being? The answer is that they needed to be created simultaneously with the seeding of divine DNA. So what the Pleiadians did was not only to start the seeds of humanity's change into divine DNA, but they created the conscious grids of Gaia as well. They had to, for the conscious grids of Gaia are a confluence of humanity's decisions brought to Gaia's energy. The consciousness that we are talking about is the spiritually sanctioned Human Being that exists with a piece of God inside him, and with DNA that has 23 chromosomes instead of the common 24 that all the others have through biological evolution.

Let us back up and say it again and make it simpler, my partner [admonition to Lee to speak more plainly]. The triad of grids on this planet that we have spoken of over and over are the consciousness grids of Gaia, and were created at the same time as the seeding of humanity with Pleiadian DNA. For all the teachings we've been giving, especially about the Crystalline Grid, these grids have been reacting to Human consciousness and compassion. Therefore, the very essence of the current Gaia energy is also related to the creation of humanity.

These are the attributes of the Pleiadians work 200,000 years ago, and it was done quantumly in ways that you have no conscious awareness of at the moment. For these things are beyond your ability to understand right now, since you are still in a single-digit dimensionality. But the result back then was "a conscious Gaia." So you might say Gaia itself was actually created quantumly from the Seven Sisters energy, just like you.

The Gaia that existed before then was still Gaia, but not as it is now. It was a Gaia that was creating the dirt on the earth and the energy of biological life of the earth. It was the mother of all life on the planet, but not a Gaia that responded to Human consciousness. That's very different. So Gaia greatly expanded when the Pleiadians came, and that was by design.

It took 110,000 years for this to settle itself, and for the ground to be ready for more than 16 species of Human Beings to leave so that only one was left. When that occurred at approximately 90,000 years ago is when you can start calibrating who Humans were and who they became.

The Others

Now, what about all of those other types of Humans, and how did they leave? I'm  going to give you an attribute of something that exists even today. This is difficult for my partner, for he has not heard this before. This information has not been brought in this fashion before. Go slowly, my partner.

The variety of species on this planet comes and goes accordingly as they are needed for the energy they create. So one of the tasks of Gaia is to create and eliminate species. When they are no longer needed for the purpose of Gaia's development, they cease to exist and they die out. If new life is necessary, if new concepts of life are needed, Gaia is cooperative and they are then created. The actual creation of species is something that environmentalists have not clearly seen. That is to say the mechanics of how it works is not fully recognized as something that is strongly coordinated with your weather. But you have already seen the mechanics of some of this in your long-term studies, for you have already noted the coming and going of many species through the ages. It's ongoing.

The Appropriateness of the Elimination of Species

Now, along come Humans and they see all this coming and going of living things, but they want to save them all - all the species that exist. For in their linear mind, all species should remain and exist, since they are here. The attribute of Gaia, however, is to eliminate them, cull them out, to bring in new ones. I just gave you the mechanics of the reasons species come and go. It's appropriate and is a natural building process for new species.

When the Pleiadians started to create the grids of the planet, Gaia cooperated in what was to come, knew the purpose, and what was needed for survival of this new spiritual Human. Gaia knew this since the energy of Gaia had seen it before [reason given below]. So the old attribute, which needed many kinds of Human Beings, slowly died out. It was natural. There was not a war. There were no horrible plagues. There were no volcanoes or tsunamis that consumed them. Through attrition, appropriateness, and 110,000 years, they disappeared.

So approximately 110,000 years ago, there was only one kind left, and this is science, for everything that you study will bear this out, and anthropologists have already seen it and have asked, "What happened back then at this time that would have eliminated these other kinds of Human variety?" It's a puzzle in science that I have just answered, for science looks only for physical events as triggers. But instead, it's the marriage of Gaia consciousness that you call "Mother Nature," which facilitated this. It's the same today when you see a variety of species diminish as Humans take over a greater portion of the earth. I'll call this "the appropriate elimination of unique life forms, which allow for the growth of global awareness and quantum evolution." Some species only exist to allow others to climb the ladder of nature, then they disappear. Gaia knows what the ladder looks like. You don't. ... ”

"The Big Picture - You Are Not Alone" - Feb 2012 (Kryon Channelling by Lee Caroll) - (Text version)