Dirt: The Erosion of Civilizations

Professor David Montgomery’s book Dirt provides a fascinating discussion about an extremely precious substance that we can’t live without, but treat like dirt.  He begins with an intimate explanation of what dirt is, how it’s formed, and how it’s destroyed — in plain, simple English. 

Then, he proceeds to lead us on an around-the-world tour, spanning many centuries, to examine the various methods that societies have devised for mining their soils, and diminishing their future via agriculture.

The book is impressively thorough, and it’s likely to blow more than a few minds, but the voice is a bit soft.  A neutral tone is mandatory for textbooks, and this may encourage casual readers to be less concerned about the future than they should be.  Connect the dots.

From a human perspective, soil is a non-renewable resource, because new soil is created very slowly, a process often measured on a geological timeframe.  For example, the soils of the Mediterranean basin were largely destroyed by 2,000 years ago, and they remain wrecked today.  They are quite likely to remain wrecked for many, many thousands of years.  Much of the region that once fed millions is a desert today.

If smoking a single pack of cigarettes reliably caused a painful death by cancer within weeks, nobody would smoke, because it’s clearly not smart.  But cancer normally takes decades to become apparent, and by the time you learn about the tumor, it’s too late to make smart decisions.  Life does not have an undo button.

It’s a similar story with societies that take up the dirty habit of agriculture, which is almost always fatal.  Once you get started, it’s nearly impossible to quit, because it’s unbelievably addictive.  Yet we continue to act like it’s a cool thing to do, because it’s a clever way to acquire trade trinkets and status, and all the other cool societies are doing it, too.  The disease often advances so slowly, over the course of generations, that nobody realizes the mistake.  But once the soil is ruined, it’s too late to become smart.  There is no wonder cure.  Game over.

Eventually, Montgomery’s world tour brings us to the United States, where the white invaders imported their dirty habit.  In Europe, many farmers were quite careful to do what they could to slow erosion, and improve fertility, using time-proven techniques, because starvation was the alternative.  American settlers promptly threw these prudent practices overboard, because they were time-consuming, and because there was an unbelievable supply of fertile soil that was readily available.  In the New World, dirt was a disposable commodity.

Settlers could get rich quick by raising tobacco and cotton.  A field of rich virgin soil could support three or four crops of tobacco, and then it would be abandoned.  It was cheaper to pack up, move on, and clear new fields than it was to manure the fields they had already cleared.  This careless attitude fueled an explosion of erosion and deforestation.  One gully near Macon, Georgia was 50 feet deep, 200 feet across, and 300 yards long.  Soil exhaustion was a primary driving force behind the westward expansion of the colonists.  Rape and run agriculture seems to have set the mold for the emerging American mindset.

In the twentieth century, when farmers bought millions of big, powerful machines, the 10,000 year war on soils mutated into a new and horrifying form.  Erosion rates skyrocketed to levels never before believed to be possible, leading to catastrophes like the Dust Bowl.  Montgomery says it like this: “Continued for generations, till-based agriculture will strip soil right off the land as it did in ancient Europe and the Middle East.  With current agricultural technology though, we can do it a lot faster.”

Here’s a line that made me jump: “Everything else — culture, art, and science — depends upon adequate agricultural production.”  Like air and water, food is essential for our survival.  Without food, our entire techno-wonderland turns into fairy dust and blows away.  We can’t live without it, but at the same time we are rapidly destroying what makes food possible — because profits today are more important than existence tomorrow.  Sorry kids!

On a bright note, Montgomery gives us a quick tour of Tikopia, a society on a tiny island that is one of the few exceptions to the rule.  They seem to have devised a sustainable form of agriculture that majors in agroforestry (food-producing trees).  They combined this with a draconian method for maintaining a sustainable population, which was far less painful and destabilizing than the effects of over breeding. 

Looking toward the future, Montgomery foresees a large number of serious problems.  Explosive population growth continues.  We are moving beyond the era of cheap and abundant energy, and this will continuously drive the price of everything upward.  Climate change is likely to deliver unwanted surprises.  Widespread destruction of soils continues, and simply converting to organic farming will not fix this.  Nor will no-till technology, which will eventually be forced into extinction by rising energy costs, or herbicide-resistant weeds.  We are running out of tricks for increasing productivity.  The end of the chemical fertilizer game is inevitable, and it will largely be replaced with recycled sewage — a priceless treasure that we are now throwing away via expensive, energy-guzzling treatment plants.

Our current system is simply not up to the task of feeding the world in the coming decades, because it’s a design that self-destructs.  We try to force the ecosystem to adapt to our food production technology, and this doesn’t work.  Instead, we need to make farming adapt to the needs of the ecosystem.  In short, we need a serious revolution in the way we do agriculture — a new philosophy that gives top priority to the health of the land, not to maximizing income by any means necessary.  How likely is this?  Don’t hold your breath.

The subject of this book centers on soil erosion.  In the good old days of muscle-powered organic agriculture, soil destruction took a thousand years to ruin a civilization, on average.  Industrial agriculture is much quicker.  It now keeps seven billion people alive by using soil to convert fossil energy into food.  But the clock is running out on cheap energy, and industrial agriculture has an expiration date.  This will give birth to a new agricultural revolution — the return to muscle-powered farming, on severely depleted soils, fertilized once again by nutrient-rich sewage.  Farm productivity will plummet.  We are close to peak food production now.

Montgomery, David R., Dirt: The Erosion of Civilizations, University of California Press, Berkeley, 2007.

NOTE: If you find this subject interesting, the first edition of Topsoil and Civilization (1955) is available for free online as a PDF download.  It follows a parallel course, but provides a different banquet of information, while coming to similar conclusions:

http://www.soilandhealth.org/copyform.aspx?bookcode=010113

New Roots for Agriculture

Wes Jackson was born in Kansas farm country, in a place where his grandfather homesteaded.  The land of his birth was being destroyed by agriculture, and this drove him crazy.  Wes and his wife Dana created The Land Institute in Salina, Kansas.  Their mission was to create sustainable agriculture, a noble 100-year project that he describes in New Roots for Agriculture.  This book is a great primer on farming — short, smart, and easy to read.

Our education system excels at graduating scholars who are blissfully ignorant about the food they eat.  Opponents of our truly horrid system for the mass production of meat, milk, and eggs often fail to recognize that our system for producing tofu, bean sprouts, and spinach is seriously defective as well.  Almost everything we eat has ecological costs far in excess of the price we are charged, and blissful ignorance keeps us marching down the wrong path.

Jackson has profound admiration for the Amish and Mennonites — America’s finest farmers — because they are religious about farming with exceptional care.  But their soil is not safe from normal hard rains, it washes away, too.  It’s heartbreaking.  No matter how hard you try, it fails.  It’s impossible to win when your primary tool is a plow (and no-till has its own serious drawbacks).

Jackson doesn’t restrict his scorn to modern stuff — agribusiness, pesticides, GM crops, the Green Revolution.  He condemns agriculture in its entirety.  It was a disaster 10,000 years ago, and it’s far, far worse today.  He has referred to it as an “accident,” but one that can be repaired.  We would be in far better shape today if we had continued dining on healthy wild foods, instead of shifting to growing crops on tilled fields.  He sees till agriculture as “a global disease” that is especially severe in the US, and “unless this disease is checked, the human race will wilt like any crop.”

Agriculture is a huge monster with a thousand heads, but it’s most terrible offense may be soil destruction, because it is largely irreparable.  Terrestrial life requires soil, and agriculture is tirelessly sending our finest soils to the bottom of the ocean.  It’s bad, and every farmer knows this.  Unfortunately, the system is designed to reward productivity, not ecosystem health.  Soil worshippers quickly go bankrupt.  Jackson is telling us nothing new, but he is shining a bright light on things that everyone should be thinking about at every mealtime.

There are a few exceptions to the rule.  In Japan and portions of northern Europe, agriculture has been relatively benign, because of unusual combinations of soil types, topography, and climate patterns — not superior farming techniques.  But almost everywhere else, it is a destructive process.  Note that neither of the two exceptions comes close to feeding their own populations.

Looking out his office window, Jackson can observe both heaven and hell — prairie and wheat field.  The prairie is beautifully adapted to the ecosystem, and suffers no erosion problems.  It actually builds healthy new soil.  The wheat field produces more calories per acre, but it is a soil mining operation, an extractive enterprise with no long term future.  Jackson’s core principle is that “no interest or value should be put above the health of the land.”  Let’s make that our planetary motto.

He believes that truly sustainable agriculture is possible.  Annual plants, like corn, wheat, and soy, need to be started from seed each year, which requires annual tilling, and results in significant soil erosion.  Perennial plants survive for a number of years.  Jackson recommends that we switch to perennials for grain production, because this would more closely resemble a prairie, and cause less erosion. 

In his plan, fields would contain a blend of different species of seed-bearing plants, not a monoculture of genetically identical plants.  The system would improve soil quality, maintain its own fertility, conserve water, have few problems with pests and diseases, require lower energy inputs, be more drought tolerant, and produce as much grain as conventional agriculture.  Because yields are highest in the first year, and then taper off, the prairie would have to be plowed and replanted periodically.  He estimates a five to ten year replant cycle.

It’s a radical idea that is much easier said than done.  To enable mechanical harvesting, the mix of species would have to ripen at the same time.  The mix would have to be fine-tuned for every microclimate and soil scenario.  The Land Institute is decades away from having a finished product, and there are no guarantees that it will ever reliably work as intended.  The Soviets had a similar idea back in the 1920’s.  They did decades of research, and then abandoned the project.  They claimed tremendous successes, but refused to show them to outsiders.

Jackson has some concerns about his vision.  The accident of agriculture began when we believed that we could cleverly control and manipulate nature.  And now, he’s attempting to correct the problem by using the same approach — controlling and manipulating nature.  That bothers him.  Sustainable agriculture must live in peace with the ecosystem, not replace the natural ecosystem with a chemical-soaked, soil-mining food factory.

This book was written over 30 years ago, when gas was 30 cents a gallon, and people thinking about Peak Oil numbered in the dozens.  In that era of innocence, you could still dream about plowing up the whole farm every five to ten years, and harvesting prairie-like grain fields with gas guzzling farm equipment.  Because Jackson’s plan requires the use of industrial machinery, it isn’t genuinely sustainable.  It can’t be harmlessly performed for the next 2,000 years, because it is dependent upon the existence of industrial civilization.

If you’re going to dream huge, magnificent, revolutionary dreams for a 100 year project, why not throw in radical population reduction, too?  An unsustainable population is, of course, completely unsustainable.  A much smaller herd would cause much less harm, and nothing is impossible when you’re dreaming. 

And why not dream of a cuisine where grains are not the foundation of the diet?  In another book, Jackson wrote that grains are core to the human evolutionary heritage.  Are they?  Many cultures throughout human history have done just fine with no grain foods at all.  Indeed, cultures that major in domesticated grains have a strong tendency to be over-crowded, belligerent, and suicidal.  Please help yourself to the nuts, berries, and grasshoppers. 

As I was reading, I kept thinking about Richard Manning’s vision of returning corn country to tall grass prairie, ripping out the fences, moving in the buffalos, elk, and wolves, and turning our bakeries into steak houses.  God was in fine form when she created prairie ecosystems, they were an absolutely brilliant design.  Ripping these perfect ecosystems to pieces with moldboard plows, planting grain fields, and exterminating the thriving community of wildness was the opposite of intelligent.

In his 1987 book, Altars of Unhewn Stone, Jackson described a 6,400 acre prairie ranch in the Flint Hills of Kansas that had never been plowed.  It supported 1,700 cattle during the grazing season, and it was mostly managed by a single cowboy.  Fertilizer was never used.  The use of fossil fuel was tiny.  Overgrazing was carefully avoided, and soil erosion was at normal levels for a healthy prairie.  If we replaced the cattle with buffalo, and gave them free range, would this be better for the land than perennial grains?  Could buffalo hunting be harmlessly performed for the next 2,000 years?

Jackson, Wes, New Roots for Agriculture, University of Nebraska Press, Lincoln, 1985.