Russell gave a presentation 'Feeding Humanity: Bronze Age to Modern Table'. A 15-minute survey of how human food systems developed — and where they now strain.
Present: Steve Davis, Julien De Jager, Guy Hamilton, Bruce Makin, Wal Mayr, Russ Reichelt, Jonathan Shaw, and Dave Straton. Absent: Tiff Guilding and Guy Drummond.
Russell served us a delicious meal of Chili con carne.
WELCOME / INTRODUCTION
Good evening. This talk traces the arc of human food systems from the Bronze Age to the present — about 5,000 years in 15 minutes.
Along the way I want to address three questions:
1. When did food become industrialised in the sense Adam Smith had in mind?
2. What are the strengths and weaknesses of how we feed ourselves now, in both wealthy and poorer nations?
3. Were the Club of Rome's Limits to Growth warnings right — and what did they miss?
The story is ultimately about civilisation itself: food systems reveal how societies organise power, allocate resources, and manage risk.
The image above shows an ancient qanat — a traditional irrigation technology — representing the physical infrastructure that made the Bronze Age food revolution possible.
We're about to trace the first 4,500 years of organised food production: from foraging to farming to the first glimmers of a market-based food economy.
BRONZE AGE FOUNDATIONS
The image on the right shows ancient irrigation infrastructure — the technology that made this agricultural revolution possible.
The key insight: food surplus was not merely an economic achievement — it was the foundation of everything else. Without stored grain, you cannot have a standing army, a priestly class, monumental architecture, or writing itself.
The Sumerians invented cuneiform script primarily to track grain in storage. The first written records in human history are essentially warehouse receipts.
The Bronze Age collapse around 1200 BCE is sobering: when the grain trade network broke down — through drought, conflict, or both — multiple civilisations fell within decades. The first warning in history that complex food systems are fragile.
KEY POINT: Whoever controls the grain controls the people. This is still true today — just expressed through supermarket supply chains rather than granary walls.
CLASSICAL AND MEDIEVAL
The mosaic on the right is from Ostia Antica — Rome's port city — showing Roman traders at work. This is the Roman commercial food system captured in art.
Rome's achievement was the world's first large-scale food logistics operation. Feeding a million people required a dedicated grain navy, North African farmland as state plantations, sophisticated warehouses (horrea), and a civil service to manage distribution.
"Bread and circuses" is often quoted as political manipulation — but the grain dole was also genuinely necessary. Without it, the urban poor would starve.
Medieval Europe is more localised and vulnerable — but it incubates the guild system, the first separation of food production from food processing. A baker in 13th-century Paris was not a farmer. That specialisation is the first faint echo of Adam Smith.
KEY POINT: From Rome to the medieval guilds, food and power are inseparable. The form of control changes; the logic doesn't.
THE EARLY MODERN PIVOT
Three things happening simultaneously, all important:
1. ENCLOSURES create the urban working class — people who no longer produce their own food and must buy it. This is the demand-side revolution that makes industrial food production necessary.
2. THE POTATO. Arriving in Europe from South America in the 1570s, the potato may have enabled European population growth in ways that made the Industrial Revolution possible. Ireland's catastrophic famine when the crop failed in the 1840s is a direct consequence of this story — the dangers of monoculture dependency in miniature.
3. COLONIAL PRODUCTION: Sugar, the defining food product of this era, was entirely produced through enslaved labour. The industrialisation of food is entangled with the history of slavery from the start.
KEY POINT: By the time Adam Smith writes in 1776, the food market economy already exists. He is documenting something already happening.
ADAM SMITH AND FOOD SPECIALISATION
Smith's pin factory is one of the most famous passages in economic writing. But notice what he says in the next breath: agriculture is different. You can't fully separate the grazier from the grain farmer the way you can separate pin-making tasks.
But here's the important point: Smith's intellectual framework — specialise, trade, let markets clear — was adopted by the food system anyway over the following 200 years. The result: monoculture regions (Kansas wheat, Iowa corn, New Zealand dairy), specialised processing industries, global commodity markets, food as a financial instrument.
What Smith could not anticipate: when food is treated as just another commodity, the things that make food distinctive — nutrition, culture, seasonality, ecological context — get optimised away.
KEY POINT: The Smithian logic works beautifully for producing calories. It works poorly for producing nourishment.
This 1898 photograph shows the interior of an industrial canning factory. Workers stand at long benches processing food at volume — Adam Smith's division of labour applied to food, exactly.
We're moving into the period when food transforms from something grown and prepared locally into a manufactured product made somewhere else, by someone you'll never meet, from ingredients you can't identify.
THE INDUSTRIAL REVOLUTION AND FOOD
The nutrition paradox: white flour — produced by the new roller mills — was cheaper and had a longer shelf life than whole grain flour. But the milling removed the bran and germ, stripping out most of the vitamins. Rickets, pellagra, and beriberi became diseases of the industrial poor who subsisted on refined grain products. Industrial food made calories abundant and nutrition poor simultaneously.
The canning story: Napoleon's armies couldn't campaign in winter because they couldn't preserve food. The French government offered a cash prize in 1795 for a solution. Nicolas Appert won it in 1809. By the 1860s, mechanised canning made this cheap enough for civilian populations.
KEY POINT: The Industrial Revolution solved the calorie problem and created the nutrition problem.
20TH CENTURY ACCELERATION
The Green Revolution genuinely saved hundreds of millions of people from starvation. Norman Borlaug's dwarf wheat varieties, combined with synthetic nitrogen fertiliser, are one of the most significant humanitarian interventions of the 20th century. He won the Nobel Peace Prize in 1970.
But the Green Revolution also set in motion forces now causing serious problems:
SYNTHETIC NITROGEN: Fritz Haber's process (1909) for fixing atmospheric nitrogen into fertiliser is perhaps the single most important agricultural innovation in history. It's estimated that nearly half the nitrogen atoms in the bodies of living humans came through Haber-Bosch synthesis. But manufacturing it requires massive amounts of natural gas — our food system is deeply dependent on fossil fuels.
MONOCULTURE: High-yield varieties work best in monoculture. The Irish potato famine was a monoculture failure. We've rebuilt that vulnerability at global scale.
KEY POINT: The 20th century mastered the production of calories. It did not master the production of health.
This supermarket aisle represents the pinnacle of the Smith/Industrial/Green Revolution project: tens of thousands of products, year-round availability, at prices lower in real terms than any point in human history.
The question I want to pose: is this picture of abundance the whole story? What is it not showing us?
GLOBAL SNAPSHOT
Hold on these numbers before moving on.
733 million hungry + 2.5 billion overweight in the SAME world, at the SAME time. This is the defining paradox of modern food systems. It is not a supply problem — we produce enough calories. It is a distribution, affordability, and quality problem.
The concentration statistic: four companies control most of the world's seed supply. This is an extraordinary level of concentration for something as fundamental as the genetic foundation of the food chain.
30% waste: if we could eliminate food waste, we could feed every hungry person on Earth several times over — without growing a single additional kilogram of food.
One-third of GHG emissions from food means that even if we decarbonised every car, plane, and power station tomorrow, the food system alone would prevent meeting Paris Agreement targets.
KEY POINT: The system that feeds us is also one of the primary systems that threatens us.
WEALTHY NATIONS
STRENGTHS: In 1800, even wealthy Europeans faced genuine food insecurity. Famine in Ireland, France, and elsewhere was within living memory for most of the 19th century. We have solved a problem that killed millions of our ancestors.
WEAKNESSES: In the United States, 55% of calories come from ultra-processed foods. This is not a matter of individual choice — it's the structural outcome of a food environment engineered to sell the most profitable products, which happen to be the most processed ones.
"Food deserts" in one of the richest nations on Earth — people who cannot access a fresh vegetable within reasonable distance. A planning and inequality failure, not a production failure.
The loss of food culture is subtle but important: when people lose the knowledge of how to grow, prepare, and preserve food — knowledge passed down for millennia — it creates a fragility that doesn't show up in calorie statistics.
KEY POINT: Wealthy nations have solved quantity. They have not solved quality, equity, or sustainability.
LOWER-INCOME COUNTRIES
Real irony: the countries with the strongest traditional food cultures often have the healthiest underlying dietary patterns — and the most fragile food security.
STRENGTHS: Smallholders on less than a third of the world's farmland feed more people than industrial agriculture does in developing nations. Remarkable efficiency through accumulated knowledge, not technology. The agro-biodiversity held by traditional farming communities is irreplaceable — it's the genetic library from which future climate-adapted crops will be bred.
WEAKNESSES: Up to 40% of food grown in parts of sub-Saharan Africa never reaches a mouth — not a growing problem, a storage and logistics problem. Solving it would be among the most cost-effective investments in food security imaginable.
THE ULTRA-PROCESSED INVASION: As high-income markets saturate, food companies move aggressively into LMICs. We are watching the Western chronic disease epidemic being exported in real time.
KEY POINT: Lower-income countries have the food wisdom; they lack the infrastructure. Wealthy countries have the infrastructure; they've lost much of the wisdom.
CROSS-CUTTING TENSIONS
The image on the right — cracked, dried earth — is what these systemic failures look like on the ground.
SOIL: We are treating topsoil as a mining resource, not a renewable asset. It takes ~500 years to form 2.5 cm of topsoil naturally. Industrial agriculture is depleting it in decades.
WATER: The Ogallala Aquifer beneath the US Great Plains is being depleted roughly 8 times faster than it recharges. When it runs out, it cannot be refilled on any human timescale. A significant portion of US wheat, corn, and cotton production depends on it.
ANTIBIOTICS: Three-quarters of all antibiotics used globally go into livestock, not human medicine. This is the primary driver of antibiotic-resistant bacteria — one of the most serious long-term public health threats we face.
KEY POINT: The externalities of the modern food system are no longer minor irritants. They are existential risks to human health, ecological stability, and the food system itself.
This is the cover of Limits to Growth — published in 1972 by a team of MIT researchers commissioned by the Club of Rome. It became one of the most controversial and widely discussed books of the 20th century, largely dismissed at the time. The question now: was it right? And did it see what was actually coming?
LIMITS TO GROWTH REVISITED
WHAT THE BOOK DID: The MIT team built a computer model tracking five variables and ran multiple scenarios. In almost all of them, the system overshoots sustainable limits and then collapses — within 100 years of publication.
WAS IT RIGHT? Largely yes, though not in the specific ways critics expected.
— Specific resource predictions (gold runs out by 2000, mercury by 2003) were wrong. Markets and technology adapted.
— But the OVERALL TRAJECTORY — exponential growth leading to overshoot — has been validated by multiple retrospective analyses.
— A 2008 CSIRO study found real-world data matching the "standard run" (worst case) almost exactly.
— A 2020 update reached the same conclusion: economic decline likely ~2040 without structural change.
WHAT IT MISSED:
1. CLIMATE CHANGE: The model included pollution but didn't distinguish greenhouse gases. The "pollution limit" turned out to be the climate system itself. Climate change threatens to destabilise the agricultural systems the Green Revolution built.
2. SEA LEVEL RISE: The Mekong, Ganges-Brahmaputra, and Nile deltas are some of the most productive farmland on Earth and among the most vulnerable to sea-level rise. These feed hundreds of millions.
3. GEOPOLITICAL ENERGY SHOCKS: When Russia invaded Ukraine in 2022, it simultaneously disrupted ~30% of global wheat exports AND a major portion of fertiliser supply. The LTG model assumed gradual exhaustion. It didn't model weaponisation.
4. DECARBONISATION: In 1972, the idea that the global community would need to deliberately transform its energy systems to prevent climate change was not mainstream. The imperative to decarbonise food systems is a genuinely new constraint.
KEY POINT: Limits to Growth asked the right question — can infinite growth continue on a finite planet? The answer was no, and still is. But the actual binding constraints turned out to be more complex, more interactive, and more politically entangled than the 1972 model could hold.
CONCLUSION
Every civilisation in history has been built on a food system. The food system determines who is fed and who isn't, what the landscape looks like, what the dominant health conditions are, how much labour is available for other things, and how resilient or fragile the society is to external shocks.
We have built the most productive food system in human history. It has broken the link between farming and starvation that haunted our ancestors for millennia.
And yet — by almost every other measure — the system is failing or under severe stress:
— It is making wealthy populations sick
— It is leaving hundreds of millions in poor nations hungry
— It is degrading the ecological systems it depends on
— It is a major driver of the climate change that threatens to undermine it
— It is concentrated in the hands of a very small number of corporations
— It proved frighteningly fragile when a war in Eastern Europe disrupted supply chains
Adam Smith was right that specialisation and trade produce extraordinary efficiency. The Club of Rome was right that exponential growth on a finite planet cannot continue indefinitely. Both were incomplete: Smith because he didn't account for ecology, nutrition, or resilience; the Club of Rome because the actual limits turned out to be more complex and politically entangled than a 1972 computer model could capture.
The challenge: to feed 10 billion people well, on a destabilising planet, without destroying the soils, waters, and biodiversity that make food possible in the first place.
That is the defining food challenge of our time. Thank you.
The Club of Rome's 1972 warning has been debated, dismissed, validated, and updated for over 50 years. The question now is not whether they were right in principle — the evidence increasingly says yes — but whether the modelling tools available to us today can tell us something more useful: not just that collapse is possible, but what we should do first, and in what order.
The next five slides address exactly that.
WHO IS IN THIS SPACE NOW?
LEFT COLUMN — The successors to Limits to Growth:
Earth4All is the most direct heir. It is technically sophisticated, explicitly backed by the Club of Rome, and its key finding is that the interventions required cannot be sequenced — they must happen simultaneously. This is an important departure from "fix one thing at a time" thinking.
The Cascade Institute's Polycrisis Core Model is the most technically novel. Instead of projecting continuous trajectories, it asks: which combinations of global system states are internally self-consistent? It finds only 11 stable configurations out of 4 million possibilities. The finding that democracy is a non-negotiable prerequisite for the positive attractor is a derived mathematical result, not a values preference.
RIGHT COLUMN — The sceptics have real points:
The Simon Abundance Index is genuinely impressive. The human capacity to substitute, innovate, and improve efficiency is consistently underestimated by resource scarcity models. Julian Simon won his famous bet with Paul Ehrlich on commodity prices precisely on this basis.
Lomborg's cost-benefit framework identifies real interventions with extraordinary returns — micronutrient programmes, malaria nets — that save lives now, not in 50 years.
BUT: Neither argument addresses non-substitutable systems like stable climate, functioning ocean chemistry, or intact soil. You cannot substitute your way out of AMOC collapse. The debate has somewhat different subject matters.
KEY POINT: The question is no longer "will limits bind?" The question is "which limits, when, and through which pathways — and what leverage do we have over the sequence?"
HAS THE OECD CHANGED ITS MIND?
The OECD is important here because it is the institutional voice of the world's largest market economies — not an environmental advocacy group. When the OECD shifts, it signals something is changing in mainstream economic thinking.
BEYOND GROWTH (2020): The Secretary-General commissioned a high-level advisory group and endorsed their conclusion that GDP growth is not an end in itself. This is a significant departure for an organisation whose founding mandate is to "achieve the highest sustainable economic growth." They have not abandoned growth, but they have officially decoupled it from wellbeing as an automatic relationship.
THE 2025 LONG-RUN SCENARIOS: This is the harder data. For the first time the OECD modelled climate damages into GDP projections out to 2100. The headline numbers:
— Under business-as-usual with a median climate damage curve: ~9% of global GDP gone by 2100. That is larger than the Great Depression.
— Under the high damage curve: 36% of global GDP. That is an economic catastrophe of a kind no living person has experienced.
— Under the fast transition scenario with high damages: net positive for every single country in the model by 2080.
The underlying baseline growth also declines from ~2.9% today to ~1.3% by mid-century, before climate damage — driven by demographics and productivity convergence. The OECD has quietly acknowledged that the era of easy growth is over regardless of climate.
KEY POINT: The OECD is not the Club of Rome. When their numbers produce these conclusions, it is harder to dismiss as ideological.
MODELLING CHAOS
There are three distinct things the new modelling science is telling us.
FIRST: tipping cascades are real. The 2024 literature review is the most comprehensive mapping of tipping element interactions to date. The key word is "interactions" — these systems do not tip independently. When the Amazon starts becoming a carbon source, that accelerates warming, which accelerates ice sheet loss, which disrupts AMOC, which alters rainfall in the Sahel and Amazon. We are dealing with a web of feedback loops, not 16 independent switches.
SECOND: we cannot predict timing with confidence. This is not a counsel of despair — it is intellectual honesty. The 2024 Science Advances paper shows that any attempt to predict when the AMOC tips requires assumptions that carry enough uncertainty to make the prediction essentially uninformative. What we CAN say: warming beyond 2°C substantially increases the probability of cascades. The risk zone is real even when the event time is unknowable.
THIRD: the Cascade Institute's approach is genuinely new. Instead of simulating what will happen, it asks: what CAN happen — in the sense of what combinations of global system states are internally coherent? This is a much more appropriate epistemological posture for chaotic systems. And the answer it finds is striking: of all the possible futures, only a tiny fraction are stable, and reaching the best one requires democracy.
KEY POINT: The new modelling science is not more pessimistic — it is more honest about what kind of knowledge is possible and more precise about which variables have leverage.
PRIORITY ORDER
Let me be clear about what this priority order is and is not. It is not a rigid sequence where you wait to complete step 1 before starting step 2 — Earth4All's central finding is that these must happen simultaneously. It is an ordering by systemic leverage: which variables have the most downstream consequences if they fail or succeed.
DEMOCRACY FIRST: This may seem surprising in a food systems talk. But the Cascade Institute's finding is unambiguous. If democratic governance fails, the model cannot find a viable path to positive outcomes. This means that everything else on this list — the energy transition, food system transformation, inequality reduction — depends on maintaining the political infrastructure to pursue them. Democratic backsliding is therefore not merely a political problem. It is an existential food systems problem.
INEQUALITY SECOND: Reducing inequality is simultaneously a population strategy (women's education and empowerment are the most powerful known fertility reducers), a political strategy (high inequality correlates strongly with climate denial and populist rejection of collective action), and a boundary condition in its own right (the "safe and just" framing requires headroom for everyone).
ENERGY TRANSITION THIRD: The OECD numbers now make this case in purely economic terms, without reference to ethics or environmental values. A 36% GDP reduction under high business-as-usual damages is simply bad economic policy. The transition is the cheaper option.
FOOD FOURTH: It is the nexus point for everything — climate, water, soil, health, equity. Transforming food is arguably the highest co-benefit intervention available to us.
POPULATION AS OUTCOME: This is the most important reframe. Population is not a cause that precedes the other problems — it is an effect of development, equity, and women's empowerment. The evidence from demographic transitions globally is consistent: when the first four conditions are met, fertility falls. Trying to control population independently of these conditions is both politically dangerous and empirically ineffective.
KEY POINT: These are not in competition. They are mutually reinforcing — which is both the challenge and the opportunity.
FINAL CONCLUSION
I want to close by connecting the two halves of this talk.
We started with the Bronze Age — when surplus grain was the organising principle of civilisation and whoever controlled the granary controlled the people.
We traced how Adam Smith's division-of-labour logic, applied to food over 250 years, produced extraordinary caloric abundance — and simultaneously produced fragility, concentration, ecological destruction, and the nutritional paradox of obesity and hunger coexisting in the same world.
The Club of Rome in 1972 asked whether this system could continue indefinitely. It couldn't. The new modelling traditions — Earth4All, the Cascade Institute, the OECD's own 2025 scenarios — confirm the core thesis while adding crucial nuance.
Here is what I find most important from all of this:
FRAMING CHANGES WHAT IS POSSIBLE.
The energy transition is not a sacrifice — it is the cheaper option on the OECD's own numbers. But it only becomes achievable politically when it is paired with equity, development, and democratic legitimacy. When it is framed as cost, as imposition, as green austerity, it generates the backlash that makes it fail.
The same is true for food system transformation. Agroecological farming, reduced meat, shorter supply chains — these are not hardships. They are a return to dietary patterns that produced healthier populations in many parts of the world. The framing as "giving things up" is a construct, not a fact.
The Cascade Institute's finding that democracy is the structural prerequisite for all positive outcomes should give us pause. We are not short of technical knowledge about what to do. We are short of the political infrastructure to do it. Protecting and reinvigorating democratic governance may therefore be the most important food security, climate security, and civilisational security investment available to us.
CLOSING THOUGHT: From Mesopotamian granaries to the OECD's 2025 scenarios, the story of food is the story of civilisation — who gets fed, who decides, and what system we build to make that decision. The challenge of the next century is to build a system that works for 10 billion people within the means of one planet. The tools exist. The knowledge exists. The question, as it has always been, is whether the political will can be assembled in time.
Thank you.
