Wild Free and Happy Sample 23

[Note: This is the twenty-third 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 202 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.]

 Super Grass

I previously mentioned the notion that humans are creatures of the grass.  Recently, I stumbled on information that added a deeper dimension to this theme.  It all began when I read that the area of global forest cover has been sharply reduced since the early Miocene Epoch.  This stimulated my curiosity, and led to an exciting wild factoid chase.  The Miocene spanned from 23 to 5.3 million years ago.  It seems that the early Miocene was wet and warm, and many ecosystems were forests.  I was surprised to learn that as late as 20 million years ago, much of Antarctica was covered with temperate forests.

Anyway, later in the Miocene, maybe 6 to 8 million years ago, it got cooler and dryer, and a new type of major ecosystem emerged — grasslands.  They can thrive where it’s too dry for trees.  Over time, expanding grassland displaced large areas of forest.  This shift was an important turning point in the human saga.  As forests shrank, there was less habitat for tree-dwelling primates, causing a number of species to tumble off the stage.  Some primates moved out onto the savannah, and figured out how to survive in open country as ground-dwelling primates.  They included the ancestors of baboons and humans. 

So, it was a gradual but substantial shift in climate patterns and ecosystems that made it possible for our ancestors to invent a new career path as hunters of large herbivores.  As the climate got cooler and dryer, grass species more tolerant of arid conditions rose in importance.  At this point, we need to take a brief side trip into some technical stuff.  I’ll keep it as short and simple as possible.

The entire family of life is solar powered.  Incoming solar energy is received by green plants, who use it to produce sugar.  This process is photosynthesis.  It converts solar energy into a form of chemical energy that plants and animals must have in order to survive.  Some animals acquire it directly by eating plant material, and others get it indirectly by dining on plant-eating animals.  Thus, photosynthesis is the foundation of life on Earth.

The process begins by splitting water molecules (H₂O) into hydrogen and oxygen atoms.  Then, in a fancy magic act, hydrogen is stirred together with CO₂ to make sugar (C₆H₁₂O₆).  The process results in some leftover oxygen atoms, which are released to the atmosphere.  Notice that animals exhale the CO₂ that plants must have, and plants exhale the oxygen needed by animals, a sacred circle dance.  Plants can use the sugar to fuel their growth, or they can convert it to starch, and save it for later.  Plants can also make fat, protein, and vitamins.  They’re much smarter than they look.

The act of snatching carbon from the air, and incorporating it into living plant tissues, is called carbon fixation, or carbon sequestration.  As more carbon gets sequestered into the plants and surrounding topsoil, then less of it remains in the atmosphere.  This is great, because too much carbon in the atmosphere can lead to catastrophic climate juju, like the freaky changes we’re now just beginning to experience.

I should also mention that petroleum and coal are substances made of sequestered carbon that accumulated over the course of 500 million years.  Big Mama Nature wisely stored it away in a safe place deep underground, where it could cause no mischief.  Unfortunately, it has become very trendy for ignorance-powered societies to retrieve enormous quantities of this ancient carbon and foolishly burn it up, in order to indulge in a decadent joyride of self-destructive childish whimsy.  Big brains can make big mistakes.  It’s so embarrassing!

And now, (gasp!) the plot thickens.  There are two categories of plant species, based on the mode of photosynthesis they use: C₃ or C₄.  C₃ produces a compound that has three carbon atoms, and C₄ produces a compound that has four carbon atoms.  Both types are very old, but the shift to a cooler and dryer climate greatly boosted the expansion of C₄ species.  Maybe 85 percent of the plant species on Earth are C₃.  Their method of carbon fixation is simpler and less efficient than C₄. 

Elizabeth Kellogg studied C₄ plants.  In one experiment she found that, under ideal conditions, C₃ plants could theoretically capture and store up to 4.6 percent of the solar energy they received, while C₄ plants could get up to 6 percent (i.e., 30 percent more than C₃).  While only 3 percent of flowering plant species are C₄, they account for 23 percent of all carbon fixation in the world.  In other words, they produce much more of the precious chemical energy (sugar) that the family of life depends on.  Kellogg calls the C₄ process a turbocharger.

There are four conditions under which C₄ plants have a big advantage — high temperature, high light, low moisture, and low nutrients.  Because they use much less water, C₄ plants better conserve soil moisture.  They also produce more root biomass, which increases their tolerance for drought and fire.  Of the 12,000 grass species, 46 percent of them are C₄, and they include corn (maize), sugar cane, millet, and sorghum.  (Mad scientists are now trying to alter DNA to make rice C₄ too.)

When critters consume C₄ grasses, this diet leaves behind physical tracks.  Spencer Wells wrote that the bones of Native Americans revealed whether they were corn farmers or hunter-gatherers.  Because corn is a C₄ grass, the bones of corn eaters contained molecular C₄ markers.  Baz Edmeades talked about the ferocious dirk-tooth cats (Dinofelis), a species that went extinct about 1.4 million years ago.  We know they were creatures of the savannah, not the forest, because analysis of their tooth enamel indicated that they dined on herbivores that ate C₄ grasses.

And now, dear reader, at long last, we are ready to proceed to the exciting conclusion of this tedious jabber.  It’s time to turn the spotlight on the heroes of this story, the C₄ grass species.  Kellogg noted that in the last 8 million years, as climate change drove the retreat of tropical forests, the domain of C₄ grasses has greatly expanded.  They are now significant components of major grasslands around the world.

C₃ grasses were better adapted to moist forest floors and limited sunlight.  They were less able to thrive on arid grasslands.  Out on the savannah, conditions were ideal for C₄ grasses, because they needed less water to enjoy a happy life.  Here they moved from the sidelines to the center stage.  Receiving many hours of direct sunlight every day, they were able to manufacture generous amounts of chemical energy (sugar), and this gave them the ability to grow rapidly. 

And so, these highly nutritious grasses became a highly desirable food source for the animals that were able to digest them, which required some adaptations.  Baz Edmeades noted that the blades of these grasses were tough, highly fibrous, and coated with abrasive silica.  Evolution responded by providing some animals with new and improved teeth that were more tolerant of abrasion, and better able to pulverize the plant fibers.  Other critters were issued new and improved digestive tracts, populated with bacteria that were fine-tuned for chemically breaking down fibrous glop.  The critters that succeeded in adapting to the new banquet made big gains in size and diversity.

Of course, too much of a good thing will have consequences.  If herds got way too large, the vitality of the grassland would be degraded, leading to starvation.  So, evolution came to the rescue by promoting a variety of big strong bloodthirsty carnivores, who delighted in inviting large herbivores to join them at lunchtime.  To make this sacred dance more sporting, evolution also encouraged the development of herbivores who could boogie across the grassland at high speeds.

Edmeades concluded that the rise of highly productive C₄ grasses radically changed the world.  It spurred the evolution and spread of an astonishing variety of grassland herbivores and their predators.  It led to the emergence of spectacular Serengeti-like ecosystems in Africa, Eurasia, and the Americas — fantastic wonderlands of abundant life.

Graham Harvey noted that the herds of grass-eating critters benefitted the grasses.  Grazing actually stimulated plant growth.  In a brilliant design, new blades of grass emerge from growing points located close to the ground, where they are less likely to be damaged by hungry teeth.  The faster that grasses can send up new blades, the more sunlight they can capture, the more sugar they can make, and the happier the whole ecosystem becomes.

Grazing also benefitted grasses by regularly nipping off the rising shoots of woody vegetation.  If trees and brush were allowed to grow and spread, they would compete with the grass plants.  Then, the herds of hungry herbivores would have less to eat, and so would the carnivores that adored red meat.  Herds religiously offered their deep gratitude to the grass people by lovingly depositing nutrient rich manure and urine all over the place.

The big picture here is that the shift to a cooler dryer climate encouraged the substantial expansion of grassland, which boosted the expansion of C₄ grass species, which propelled the evolution and expansion of large grazers and carnivores, which boosted the global tonnage of living meat.  These megafauna migrated and settled on five continents (not Australasia).  Around the world we find species of horses, bison, elephants, antelope, deer, hyenas, wolves, bears, and so on.  The moral of this story is that climate change can radically alter the face of the planet, and the family of life.

Later in this amazing transformation, another powerful agent of radical change joined the cast of the grassland soap opera.  These critters walked on two legs, and resembled what you see in the mirror.  They eventually assumed the role of apex predators, something that no other primate had ever attempted.  Our ancestors did not wait patiently for evolution to provide them with the speed, strength, fangs, and claws that are customary for natural born carnivores.  Instead, they invented hunting weapons, learned how to make fire, and began experimenting with a way of life that no other animal in the history of the planet had ever attempted.  It’s notable that every other animal species continues to live like they did a million years ago — ultra-conservative, and perfectly sustainable.

The advance of the new critters marked the emergence of an extremely spooky, highly contagious, multi-drug resistant virus known as cleverness fever.  For a few million years, its mind-altering effects gradually intensified.  Ten thousand years ago, they surged.  Today they are skyrocketing.  Humankind is now engaged in full scale warfare against the entire family of life, including itself.  A lively and entertaining soap opera has shape shifted into the mother of all horror shows.  Will the current swing to a much warmer climate provide the miraculous silver bullet cure for the mass hysteria of cleverness fever?  Stay tuned.

Wild Free and Happy Sample 02

[Note: This is the second 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 196 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.] 

Our Tree Critter Ancestors

The dawn of life on Earth began maybe four billion years ago, with the emergence of single-celled beings, the common ancestors of all forms of life, including us.  Let’s fast forward to around 65 million years ago, when our first primate ancestors came into existence, not long after dinosaurs moved off the stage.  These critters were squirrel-sized, and lived high above the ground in the humid tropical rainforests of Mother Africa.  They were probably insectivores, furry little hunters that dined on the delicious flesh of bugs and grubs.

Arboreal (tree-dwelling) primates had little need for a powerful sense of smell like most terrestrial (ground-dwelling) animals have.  What they needed was excellent stereoscopic vision, via forward oriented eyes that provided accurate depth perception, so they could scamper and leap through the branches without mishap.  Being able to perceive colors made it easier to find ripe fruit, which was a primary food source.  Even today, bright red objects attract our attention.

Their hands and feet evolved into forms fine-tuned for grasping bark, vines, and branches, with toes and fingers tipped with nails, not claws.  Fingers were long and curved, wrists freely rotated, and shoulder joints were flexible.  An acute sense of touch and a sharp mind helped them excel at airborne acrobatics.  Humans retain a number of these arboreal traits.

Our ancestors were tree-dwellers for most of the 65 million year saga of primates.  A look in the mirror shows clear evidence of this heritage.  Most primate species today remain partly arboreal.  Humans are the only living primates that are fully terrestrial.  Large male gorillas do not sleep in the trees, but the other gorillas do.

In the rainforest, food was available year round, so our ancestors enjoyed an easy life.  Living amidst a cornucopia of organic fruit, nuts, insects, and assorted tree critters, they could live happily without tools, fire, cooking, cell phones, or psych meds.  The climate was comfortable, so there was no need for clothing.  A simple tree nest was all they needed.  It was a wonderful way of life, while it lasted.  They only used renewable resources, and they left no permanent scars on the forest.  Like all other animals at the time, they had a way of life that was genuinely sustainable.

Shift to the Savannah

Climate change is a trickster that takes great delight in periodically pulling the rug out from under stable ecosystems, and watching them scramble to survive.  It’s an exciting roller coaster of hot and cold, wet and dry, calm and stormy.  Species that can’t adapt to changing conditions go extinct, creating opportunities for other species to fill their ecological niche.  The show of life must go on.

Long, long ago, in Mother Africa, the climate was warm and moist, home to the magnificent rainforests in which primates evolved.  Later, around five million years ago, as glaciers grew in the Northern Hemisphere, the climate in African rainforests began to shift to cooler and dryer.  By two million years ago, lush rainforests were far smaller, largely replaced by expanding savannahs (grasslands with scattered trees).  If it wasn’t for climate change, you might be sitting naked on a branch today, wild, free, and happy in a lush rainforest paradise, nibbling on fruit with your friends and family, in a clean, healthy, sustainable world.

As the rainforests shrank, our tree-dwelling ancestors were something like tadpoles in a puddle that was drying up.  Many species of arboreal critters went extinct, but not all of them.  The ancestors of chimps, bonobos, gibbons, and orangutans were able to remain in the forest and avoid extinction, while baboons, gorillas, and our ancestors took a deep breath, moved to the ground, and tried to adapt to a new way of life.

On the savannah, our early ancestors were weird looking, funny smelling undocumented immigrants, attempting to survive in a habitat for which evolution had done little to assist them.  Their limited speed, size, and strength were serious drawbacks.  They were newcomers in a grassland neighborhood where most of the long-term residents had been coevolving for millions of years.  The new neighborhood included numerous large carnivores that were strong, fast, and equipped with sharp claws and fangs.  They specialized in weeding out the injured, sick, elderly, immature, and inattentive.  Many of our ancestors became organic cat food.

To survive, our ancestors used several defensive strategies.  They lived in groups, where many eyes were constantly paying attention to the surroundings.  When someone noticed a threat, loud calls were made to alert the gang, and the predator lost the advantage of surprise.  Sometimes they mobbed hungry predators, aggressively assaulting them.  Other times they quickly scattered in every direction.  The ancestors were careful to be as invisible as possible.  They chose sleeping places that offered the most security.  As a result of their cleverness, luck, and risky choices, an enormous number of ground-dwelling primates survive today.

Rainforests have high biodiversity, they provide a pleasant home for huge numbers of species.  Savannahs support far less biodiversity but, unlike dense forests, they provide excellent habitat for many large animal species.  A square mile of rainforest contains tons of biomass in its trees, far more than a square mile of grassland, but grassland can produce more new biomass every year, primarily during the wet season.  This nutritious vegetation, which includes high-energy seeds, grows close to the ground, a convenient location for grazing animals. 

The biological productivity of grasslands (savannahs, prairies, and steppes) encouraged the emergence of large herds of herbivores and their predators.  When our ancestors moved to the ground, evolution had not equipped them for hunting large game, or escaping from speedy carnivores.  They had two options, adapt or go extinct.

Where the Wild Things Were

For the first billion years of life on Earth, all of our ancestors were single celled.  One day, we aren’t sure why, a hungry organism ate a delicious bystander, and became the first predator.  Predation inspired evolution to become very creative.  Some organisms became mobile by developing cilia or tails.  Others shape shifted into multi-celled life forms.  Critters developed scales, spikes, shells, fangs, and many other clever defenses.  Thus, one group survived by dining on the unlucky, and the bigger group survived by evolving every imaginable trick for cancelling lunch dates with predators.

When predators became too powerful, they would wipe out their food supply, blush with embarrassment, and starve.  Prey that managed to survive evolved stronger defensive capabilities.  But if they got too good at this, their population would explode, deplete the available nutrients, and the vast mob would perish in an undignified manner.

Thus, evolution is an elegant balancing act.  If the prey gets one percent faster, the predator gets one percent faster, not two.  This balancing act is the subject of William Stolzenburg’s book, Where the Wild Things Were.  More specifically, the book focuses on how humankind uses its brilliant technological innovations to bypass the limits of our current state of evolution, upset healthy balancing acts, and devastate ecosystems, often unintentionally.

In the early 1970s, zoologist James Estes travelled to the Aleutian Islands of Alaska to do research on sea otters.  Sea otters can grow up to four feet long (1.2 m), and they have incredibly soft fur.  Stylish women with too much money loved wearing fur coats, and for 150 years, from Alaska to Baja, otter hunting was a serious business, and very profitable.  Somewhere between 500,000 and 900,000 otters lost their hides to the fashionable dames of high society.

The island of Amchitka had a healthy population of otters, and this is where Estes began his study, scuba diving in frigid water.  Beneath the waves were thriving jungles of kelp, a popular hangout for a number of aquatic herbivores.  Kelp can grow up to 200 feet tall (61 m).  Urchins enjoy dining on kelp, and sea otters enjoy dining on urchins.  What Estes observed was a healthy balance between the kelp, urchins, and otters.

Later, he spent some time on the island of Shemya, where the great extermination had wiped out the otters.  Only a few had since recolonized there.  The ecosystem here was stunningly different from Amchitka.  In the absence of otters, the urchins exploded in numbers, and many were huge in size.  The sea floor was wall-to-wall urchins, and there was no kelp at all. 

So, when the keystone predators (otters) live in peace, the ecosystem is healthy and balanced.  When they are eliminated, the ecosystem becomes a train wreck — a chain reaction known as a trophic cascade.  Predators are essential.

A similar scenario occurred when Zion National Park was established in Utah.  To make the park safe for tourists, the cougars (mountain lions) were exterminated.  In their absence, the population of mule deer exploded, and the land was stripped of vegetation.  The forests were dying, because young seedlings were devoured by deer.  Meanwhile, over the hill in North Creek Canyon, the cougars had been left alone, and the land was remarkably alive and healthy.

The Kaibab Plateau in Arizona became a game preserve in 1906.  Deer hunters were kept out, and 6,000 large carnivores were deleted.  The deer population skyrocketed from 4,000 to 100,000, and the vegetation was promptly vacuumed up.  In the winters of 1924 and 1925, 80,000 deer starved to death.  Ecosystems pay an enormous price for the stunning ecological ignorance of literate, educated people, who spend years in miserable classrooms carefully absorbing spooky illusions.

Wolves and grizzlies had been absent in the Tetons for quite a while.  Then, a few began drifting in from Yellowstone.  At first, the moose and elk had no fear of them.  Wolves calmly strolled into the herd and snatched their young.  Before long, they learned that fearing predators was beneficial.  Something similar to this innocent fearlessness likely existed in every ecosystem when humans first arrived with their state-of-the-art killing technology.

In the 1950s, Paul Martin connected some archaeological dots.  The megafauna of the world, that had survived almost two million years of ice ages, suddenly blinked out whenever armed humans arrived in a new region.*  This realization gave birth to his Pleistocene Overkill hypothesis, “that man, and man alone, was responsible for the unique wave of Late Pleistocene extinction.”  Despite many loud objections, it has generally been accepted, but it fails to explain the large numbers of mammoths and rhinos found in Siberia and Alaska.  It also causes those who worship at the crumbling Temple of Human Omnipotence to become moody and irritable.

Whatever your opinion on this controversy, it’s easy to argue that during the long era of warm weather (since 9600 B.C.), the pristine state of America was the Pleistocene, not 1492.  In 2005, a group of biologists published a paper on rewilding in the journal Nature.  It recommended the reintroduction of missing species like cheetahs, camels, lions, and elephants.  The mainstream crowd soiled their britches and howled hysterically.

It was, like, totally groovy to reintroduce pretty butterflies, but the huge backlash boiled down to “no lions in my backyard!”  This was the lively kickoff for what will be a long and bumpy process of attitude evolution — or a fierce backlash from those who have yet to free themselves from the tiny cage of anthropocentric hallucinations.

I wonder if the systematic extermination of millions of predators over the years is associated in any way with the current explosion in the human population.  When climate change forced our ancestors onto the savannah, evolution had not prepared us for living amidst fast, powerful, heavyweight predators.  We developed a highly unusual dependence on technology in order to survive, thereby knocking over the evolutionary balancing act.  “They would eventually wield the power to level mountains, to dam the biggest rivers, to coat entire continents in concrete and crops, to alter the climate as it had once altered them.”  The chapter on how we morphed into apex predators is fascinating.

Today, we almost never encounter man-eating predators running lose.  We no longer have to pay careful attention to reality, ready to react at any moment, fully present and alive.  The world has become safe for pudgy cell phone zombies — an empty, dull, and lonely place.  This is seen as normal.  I disagree.

* Megafauna survived in Africa because they evolved together with hominids, but there’s more to the story.  Lars Werdelin, a specialist in African carnivores, has learned that there used to be far more large carnivores.  Between 2 and 1.5 million years ago, many large carnivores went extinct.  This is about the time that tool-using, meat-eating Homo erectus appeared.  (Werdelin, Lars, “King of Beasts,” Scientific American, November 2013, pp. 34-39.)

Stolzenburg, William, Where the Wild Things Were, Bloomsbury, New York, 2008.