[Note: This is the ninth sample from my rough draft of a far
from finished new book, Wild, Free, & Happy. I don’t plan on reviewing more books for a
while. My blog is home to reviews of 199
books, and you are very welcome to explore them. The Search field on the right side will find
words in the full contents of all rants and reviews, if you are interested in
specific authors, titles, or subjects.]
The
Dance of Hominin Evolution
Experts have endless lively disputes about many aspects of
hominin evolution. There were many
predecessors to Homo
sapiens, but an accurate lineage of the hominin family tree does
not exist, and probably never will. The physical
evidence discovered so far is extremely incomplete. It’s like a million piece jigsaw puzzle where
more than 99 percent of the pieces are missing, and most of these have
disintegrated over time.
Evolution does not resemble automobile assembly plants, where
production of 2018 models completely ends on a fixed date, and the process of
building new and improved 2019 models begins.
The transition from one species to the next is a blurry process that can
take hundreds of thousands of years, and isolated groups of the same species
can evolve in significantly different ways.
In addition to arguments over the branches of the family
tree, the dates assigned to specific events are also controversial and inconsistent. Technology for dating specimens has advanced
over the years, and different technologies often produce very different dates
for the same bone or artifact. Also,
ongoing field work continues to make new discoveries. So, did Homo
sapiens emerge 190,000 years ago, or 300,000? Did they arrive in Europe 50,000 years ago or
36,000? And so on. Numbers are slippery.
If we step back a bit, and disregard numeric dates, there is
general agreement on a number of big picture trends. Homo
erectus is much older than Neanderthal, and both are older than Homo sapiens. Homo
sapiens evolved in Africa, and Neanderthals did not. Erectus and Neanderthals are not associated
with megafauna extinctions, but our species certainly is. For the purposes of this book, the trajectory
of trends is important — event A preceded event B. All numeric dates presented here are
controversial.
Although the Earth Crisis has roots much older than Homo
sapiens, our species is playing a starring role in this catastrophic
tragedy. For this reason, the following
chapters will primarily focus on humans, and the emergence and expansion of
some highly destructive cultures. But
first, a few comments on two notable cousins.
Erectus
and Neanderthal
Homo
erectus emerged maybe 1.9 million years ago, and eventually spread
across some of the warmer regions of Africa, Asia, and Europe. They may have been an early ancestor of
modern humans. Erectus hunted, gathered,
and used stone tools. They were the
first hominins to evolve a larger than average brain, and they may have been
the first to domesticate fire. Erectus
maybe walked off the stage somewhere between 200,000 and 50,000 years ago. Their long era of existence does not
correspond to extinction spasms or serious ecological injuries. Erectus apparently lived on Earth much longer
than Neanderthals did.
Neanderthals probably evolved north of the Mediterranean, not
in Africa. Their remains have been found
in Siberia, the Middle East, and Europe.
The earliest discoveries date to maybe 350,000 years ago. We share up to 99.9 percent of our DNA with
them. Because they lived in non-tropical
regions, they evolved thick bodies with large bones that provided greater strength
and better cold tolerance. Elizabeth
Kolbert noted that modern humans have up to four percent Neanderthal DNA.
Erectus, on average, had 1,000 cc brains. Neanderthals were the brainiest hominins, at
1,600 cc. Sapiens averages a modest
1,350 cc. Could our smaller brains be
the result of having access to cutting edge new technology (javelins, harpoons,
bows and arrows, etc.)?
Kathleen
McAuliffe reported on research finding that human brains have shrunk about
10 percent in the last 20,000 years. The
Homo sapiens
with the biggest brains lived in Europe 20,000 to 30,000 years ago. They were the Cro-Magnons, who had to overcome
the many new challenges of surviving in snowy ecosystems, while fending off
hungry cave lions, cave hyenas, and saber-tooth cats. The shrinking brain trend has been found in
China, Europe, Africa, and even Australia, which remained Stone Age until
1788. Why? Perplexed experts propose some theories, but
they don’t know for sure.
One study found that brains get smaller as population density
increases. Tim Flannery suggests that modern
consumers live like cattle on a feedlot, all our needs conveniently provided. We no longer have the skills or knowledge to
survive in the wild. Thirty species of
animals have been domesticated, and for every one of them their brain volume
was 10 to 15 percent smaller than their wild ancestors. Some think that humans domesticated
themselves.
Anyway, the trademark Neanderthal weapon was a heavy thrusting
lance. Hunters had to slowly, silently,
and very skillfully approach the prey undetected, then suddenly charge the
animal, firmly gripping the spear with both hands, and ram it deep into its
flesh. Readers who have hunted hippos
with wooden thrusting spears know that this can be very dangerous. One site in Croatia contained the remains of
75 Neanderthals, and none were older than 35.
Many of their bones had healed fractures, suggesting painful accidents
or encounters with fierce animals. Dying
of old age was unlikely.
The climate of the Neanderthal era was like a roller coaster. In Europe, they were pounded by an era of
extreme cold maybe 70,000 years ago.
From maybe 50,000 to 30,000 years ago, the climate was a spastic freak
show. Clive Finlayson noted that the
climate often flip-flopped between warm periods and intensely frigid. Radical shifts could arrive suddenly, and
last hundreds or thousands of years, all across Eurasia. Youngsters might grow up in a chilly steppe
ecosystem that used to be a comfortable forest in the days of their grandparents.
Would Neanderthals have become the modern global primate if Homo sapiens had
blinked out in Africa? I sometimes
wonder if real estate was a significant limiting factor. Caves were luxurious addresses during glacial
centuries, compared to hide-covered teepees or huts. The primo caves were south (sun) facing, and
ideally overlooked the seasonal migration routes of animal herds. But there was a limited number of caves, and
many were not vacant. Neanderthals were
always welcome dinner guests when they stumbled into caverns inhabited by
hungry, jumbo-sized cave lions, cave hyenas, and cave bears.
In warmer and wetter periods, glaciers retreated, and tundra
transformed into forest and grassland, habitat for critters like red deer,
horses, and moose. In colder and drier
periods, glaciers advanced, forest retreated, and tundra returned, as did
mammoths, woolly rhinos, and reindeer. Neanderthals
listened to their growling tummies, and went where the meat was. They migrated northward in warmer eras, and
retreated south when blast freezers returned.
The last Neanderthals died on the sunny shores of the Mediterranean, in
Gibraltar, maybe 40,000 to 28,000 years ago.
This was definitely after the arrival of humans in Western Europe, and
before the spasm of megafauna extinctions on the continent.
Our human supremacist culture routinely preaches that
Neanderthals were pathetic dullards.
During their long vacation in Europe, maybe 270,000 years, Neanderthal
technology didn’t change much. From the
supremacist perspective, Neanderthals’ 350,000 year era of stable, low impact,
ecological sustainability was indisputable proof of low intelligence.
Elizabeth Kolbert absolutely disagreed. Neanderthals lived in Europe for a very long
time while affecting their ecosystem no more than any other large mammals. Flannery noted that, for hundreds of
thousands of years, Neanderthals coexisted with straight-tusked elephants,
mammoths, and woodland rhinos — without driving them extinct. If humans had never wandered in from the
Middle East, Europe might still be a wild, free, and happy celebration of
Neanderthals, Irish elk, saber-tooth cats, straight tusk elephants, and aurochs. What’s wrong with that?
Everything! The supremacists
leap to their feet, jump up and down, spitting, shouting, smashing bottles. Humans are blessed by incredible
intelligence, brilliant innovation, complex hunting weapons, sophisticated
language skills, artistic creativity, decorative ornaments, and the powerful
ability to invent totally irrational beliefs, accept them as absolute truth,
and exterminate large numbers of nonbelievers.
Ancient mystical stories invented by Homo
sapiens proudly assert that Homo
sapiens is the absolute Crown of Creation, and the rest of the
family of life was provided for our sustenance, amusement, and assorted perversions.
OK. Stop right
here. Reread the list of human blessings
in the previous paragraph. For the most
part, these are not characteristics of species that managed to live sustainably
for more than a million years, like the chimps, baboons, lions, horses, and on
and on — “ordinary animals” in other words.
In the big picture, it’s not irrational to conclude that the unusual
intelligence we have acquired is powerful, dangerously irrational and
destructive, and has become the primary threat to our continued existence.
For 150+ years, it has been a normal and respectable
tradition for scholars and theologians to line up and urinate on the stupid
Neanderthals. European intellectuals
were quite sure that the Garden of Eden was located rather close to
London. They were stunned and bewildered
by the growing evidence that the ancestors of all hominins trace back to Mother
Africa. All Homo sapiens living 50,000 years ago
had beautiful dark skins. Oh my
God! It can’t be true! Horror!
In 2014, Paola Villa and Wil Roebroeks reexamined the
traditional beliefs in Neanderthal inferiority, to see if the latest
archaeological research still supported them.
They did not find compelling data.
They also pointed out that the traditional beliefs of human superiority
in language, symbolic communication, cognitive abilities, and abstract thinking
were impossible to prove via archaeological data. These were the biased opinions of supremacist
imaginations. Science is not required to
be rational, and very often isn’t.
Sustainability
Doesn’t Suck
Anyway, Neanderthals demonstrated that bipedal primates with
huge brains can live sustainably for several hundred thousand years, in extremely
challenging conditions, without agriculture, metal making, animal enslavement,
fish mining, deforestation, or writing.
In fact, stability is not a problem or flaw. Stability sounds like a fun and healthy
alternative to mindless perpetual growth, fanatical eco-destruction, and
devastating hurricanes of irrational illusions.
Clive Finlayson reminded us that no animal species can
foretell the future. When life is
comfortable, and the ecosystem is not being ravaged, the safe and intelligent
option is to be conservative, and remain on the well-worn time-proven
path. But when the <bleep> hits
the fan, and traditions totally fail, innovation might be a less dangerous
option. The path of innovation is risky,
often leading to unintended consequences and bloody surprises. In worst case scenarios, innovation can
backfire spectacularly, as 7+ billion people are now painfully
discovering. Yikes!
Chris Stringer reminded us that the myth of progress is a new
idea. The notion of utopia-bound
continuous improvement is a bit over 200 years old. Civilization was imagined to be an upward
spiral.
But in earlier civilizations, mobs of loonies were furiously mowing
down ancient forests, triggering landslides, flash floods, and harbors choked
with silt. Each new generation inherited
an ecosystem that was obviously in worse condition. The passage of time was seen as a downward
spiral of decay and decline, an inevitable one-way descent into social and
ecological Armageddon.
Hesiod, an ancient Greek thinker, described the glorious days
of his venerable ancestors as the Golden Age, when men were pure and lived like
gods. It was followed by a descent into
the Silver Age, the Copper Age, the Bronze Age, and finally the Iron Age, when
men were violent, foul-mouthed, and fascinated by every form of evil.
Stringer noted that the wizards of modern society are
possessed by an overwhelming and irrational blind faith in progress and
perpetual growth. We are far more
advanced than Neanderthals, and they were better than Erectus. You and I are lucky to enjoy the amazing
pinnacle of billions of years of evolution.
Stringer does not see this as proof of divine destiny. He believes that the fact that Neanderthals
blinked out, and we didn’t, was largely a result of chance. We survivors were assisted by the good
fortune of being in the right place at the right time.
For example, about 70,000 to 75,000 years ago, the Mount Toba
super volcano erupted on the island of Sumatra, spreading enormous amounts of
ash. In some regions of India, up to 19
feet (6 m) of ash accumulated. Much
incoming sunlight was blocked, and global temperatures may have dropped by 3°
to 5°C for several years. Others imagine
an intense thousand year instant ice age.
Still others suspect far less global impact. One theory, presented by geneticists, asserts
that the human population plunged to 5,000 to 10,000 individuals — implying
that we nearly went extinct. Others
point out that there is no evidence of extinction spasms among mammals at this
time. It’s not easy being an expert on
days long past.
Anyway, Stringer suggests that if a similar eruption had
happened closer to Africa, instead of Sumatra, it could have been game over for
our species, but maybe not Neanderthals, who resided north of Africa. Or, today might look very different if the
rollercoaster of ice ages had occurred in a slightly different pattern over the
last 200,000 years. The outcome could
have easily been quite different. Chance
is powerful juju. Stringer is not a member
of the progress cult. He believes that
our long-term future is entirely unpredictable. I agree.