May 2026

Ecological economics

Infinite Growth Is Impossible: What Mainstream Economics Refuses to Face

Why no material economy can grow indefinitely on a finite planet: impossible decoupling, production peaks, critical metals, water, sand, phosphorus, soils and planetary boundaries.

Jean-Christophe Duval

Introduction

The central promise of modern economics can be reduced to one sentence: tomorrow, we will produce more than today. For two centuries this promise has structured our institutions, our political imagination, welfare states, financial markets, public debts, pensions, companies and even our intimate idea of progress. Growth is no longer merely an indicator. It has become a civil religion.

But this religion rests on a physical impossibility. An economy does not float in a vacuum. It extracts, transforms, transports, consumes and rejects. It mobilizes energy, water, soils, minerals, sand, wood, oil, gas, coal, copper, iron, lithium and phosphorus. It depends on gigantic infrastructures, global supply chains, carbon sinks, biogeochemical cycles and living ecosystems. The Earth is not infinite.

The question is not whether growth can continue for a few years, a few decades, or in some sectors. The real question is more radical: can an economy based on permanent expansion be compatible with a finite world? The answer is no. Not because of pessimism or ideology, but because no material system can grow indefinitely in a finite space with finite resources, finite absorption capacities and already destabilized ecological balances.

The myth of decoupling

Mainstream economics usually answers this objection with one word: decoupling. The idea is that GDP could keep growing while resource use and environmental damage decline. In other words, we could have more monetary wealth, more consumption and more activity while using less matter, less energy, less water and emitting fewer greenhouse gases.

The argument is attractive because partial examples do exist. Some countries have reduced territorial emissions while GDP has grown. Some technologies have become more efficient. Some sectors seem less material than before. But this picture hides three decisive problems.

First, part of the decoupling observed in rich countries is imported decoupling: extraction and emissions are displaced to producing countries. Second, relative decoupling is not absolute decoupling: using fewer resources per unit of GDP does not help if total production grows faster than efficiency gains. Third, the decoupling required would have to be global, rapid, sustained and massive. This is not what the planet is experiencing.

Growth is not immaterial

Another contemporary myth is the belief that our economies have become immaterial. Because we speak of digital services, artificial intelligence, data, platforms, software and finance, we imagine that wealth has detached itself from matter. This is an illusion.

The digital economy rests on data centers, undersea cables, satellites, servers, devices, semiconductors, rare metals, electricity, cooling water, mines, factories, transport and electronic waste. Finance rests on the real economy it sometimes claims to transcend: every financial asset is a claim on future real wealth.

Even services are not weightless. Tourism depends on aircraft, roads, hotels, water, land and landscapes. Healthcare depends on buildings, drugs, equipment, logistics and energy. Education depends on infrastructure, transport, hardware, heating and networks. There is no economy without a material metabolism.

Global resource extraction is exploding

One of the most important facts of our time is also one of the least discussed: humanity extracts far more material than it did in the past. Biomass, metal ores, non-metallic minerals and fossil fuels have all expanded massively since the middle of the twentieth century.

Concrete, steel, sand, copper, aluminum, plastics, fertilizers, hydrocarbons and critical metals form the material skeleton of industrial civilization. The world economy has not replaced matter with information. It has added information on top of matter.

This is where the argument against infinite growth becomes unavoidable: even when technologies become more efficient, the total scale of the system expands. Unit gains are absorbed by rising volumes.

Production peaks: when reality meets economics

Resource depletion is often imagined as a sudden disappearance: one day there is oil, copper or lithium; the next day there is none. That is not how scarcity works. The real issue is the availability of resources that are accessible, concentrated, affordable, energetically profitable, politically stable and ecologically acceptable.

Oil is the clearest example. What matters is not only the quantity remaining underground, but the net energy required to extract it. When easy fields decline, societies move toward deeper, more diffuse, more polluting, more expensive and more risky resources.

The same logic applies to many minerals. When richer deposits are exhausted, ore grades decline. More rock must be crushed, more water consumed, more energy used and more mining waste produced to obtain the same amount of metal.

Oil, the blood of globalization

Oil remains one of the most strategic resources in the world economy. It powers transport, industrial agriculture, petrochemicals, plastics, fertilizers, machines, logistics, aviation, shipping, armies and much of the modern organization of the world.

Global growth was built on fossil energy that was abundant, dense, transportable and historically cheap. Believing that we can maintain the same level of material expansion by simply replacing that energetic base with renewables is a major mistake.

Renewables are indispensable. But they do not magically replace the entire fossil system. They require metals, grids, storage, infrastructures, land, maintenance, water, concrete, steel and a redesigned social organization.

Copper: the nerve of electrification

Copper is one of the great bottlenecks of the twenty-first century. It is essential for electric grids, motors, cables, transformers, electric vehicles, wind turbines, solar panels, buildings, data centers and almost every form of electrification.

An economy that intends to replace fossil uses with electric ones will need enormous quantities of copper. The problem is not that copper disappears tomorrow. The problem is that the richest deposits have largely been exploited, new mines can take fifteen to twenty years to develop, ore grades are declining and mining depends on energy, water, machinery and political stability.

Copper reveals the central contradiction of green growth: the more we electrify without reducing volumes, the more we shift pressure from hydrocarbons to metals.

Lithium and the illusion of clean mobility

Lithium has become the symbol of the battery transition. It is essential for electric vehicles, stationary storage and many electronic devices. But it also reveals the limits of a transition imagined as a simple replacement of the existing fleet.

Replacing every combustion car with an electric car does not solve the question of vehicle mass, urban sprawl, roads, parking lots, tyres, particles, copper, steel, aluminum, lithium, nickel, graphite and electricity demand. An electric car is preferable in many uses. A civilization of two billion electric cars would still be an extractive civilization.

The question is not only how to produce cleaner cars. It is why we organized our societies around such a massive need for individual cars.

Iron, steel and concrete

Iron is not rare in a simple geological sense. But steel is a systemic issue. Bridges, buildings, vehicles, railways, ports, factories, pipelines, wind turbines, ships and heavy infrastructures depend on it.

Producing steel requires ore, energy, often metallurgical coal, blast furnaces and enormous industrial chains. Recycling is essential, but it cannot by itself feed an expanding global economy, especially where infrastructures are still being built massively.

Concrete has the same problem: cement, sand, gravel, water, energy and transport. Growth is not an abstract curve. It is poured concrete, molten steel, roads, quarries and covered soils.

Sand: the resource nobody saw coming

Sand is everywhere: concrete, glass, roads, buildings, infrastructures and electronics. It may seem infinite because deserts exist. But desert sand is usually too round and too smooth for concrete. River, beach, seabed sands and aggregates are the strategic materials.

Sand extraction destroys ecosystems, worsens coastal erosion, fuels trafficking, alters riverbeds and weakens entire territories. It is the perfect example of a banal resource made critical by the gigantic scale of consumption.

When even sand becomes a resource under pressure, the issue is not isolated scarcity. It is the size of the global economic metabolism.

Freshwater: the vital limit

No economy functions without water. Water is needed for agriculture, industry, energy, mining, cities, semiconductors, textiles, chemistry, cooling systems, mineral extraction and life itself.

In many regions, water tensions already reveal conflicts between agriculture, industry, tourism, cities, power generation and ecosystem protection. Water shows that ecological limits are not only global. They are local, territorial, seasonal, social and political.

A tonne of lithium, a hectare of maize, a semiconductor plant or a tourist resort does not have the same meaning in a humid region and in a basin already under water stress.

No phosphorus, no industrial agriculture

Phosphorus is indispensable to plant life and therefore to modern agriculture. Phosphate fertilizers have increased yields, but they also created a deep dependence on concentrated mineral resources, global supply chains and destructive agricultural practices.

Phosphorus embodies a double limit. It is critical to feed a large world population, yet when it leaks into aquatic environments it causes eutrophication, algal blooms, dead zones and ecosystem degradation.

We lack phosphorus in the right place while releasing too much in the wrong place. This absurdity reveals the irrationality of the current economic metabolism.

Soils and biomass: the living foundation

Soils are not empty surfaces waiting for urbanization, farming or industry. They are living systems. They store carbon, filter water, host biodiversity, support food production and regulate hydrological cycles.

Growth destroys soils through artificialization, erosion, compaction, salinization, pollution, monocultures, deforestation and overuse. The problem is not only a resource taken in isolation. It is the destruction of the conditions of regeneration.

An economy may harvest wood and cultivate land. But if it takes faster than ecosystems regenerate, it turns the living world into liquidated capital.

Planetary boundaries and overshoot

The planetary boundaries framework shows that humanity is not facing one crisis but a systemic crisis of the Earth system. Climate, biodiversity, nitrogen and phosphorus cycles, freshwater, soils, ocean acidification, chemical pollution, aerosols and ozone are interdependent conditions of biospheric stability.

When several boundaries are crossed at once, risks do not merely add up. They reinforce one another. Climate change intensifies droughts. Droughts weaken soils. Degraded soils store less carbon. Collapsing biodiversity reduces ecosystem resilience.

Infinite growth is therefore incompatible with planetary boundaries because it rests on the permanent expansion of pressures on an already destabilized system.

The rebound effect: the trap of efficiency

Mainstream economics loves efficiency. Better engines, low-consumption bulbs, insulated buildings, optimized industrial processes and smarter algorithms are all useful. But efficiency does not guarantee absolute reduction of impacts.

When a use becomes cheaper, it can spread. A car that consumes less may encourage more driving. More efficient screens may multiply. More efficient digital systems may increase data use. Cheaper flights increase air traffic. This is the Jevons paradox.

Efficiency without limits becomes an accelerator of growth. Sufficiency asks a different question: what do we truly need, which uses are legitimate, which volumes are sustainable and which activities must decline?

The fable of substitution

When a resource becomes problematic, the dominant discourse often answers: we will replace it. Oil by electricity, coal by solar, plastic by paper, concrete by wood, combustion engines by batteries.

But every substitution has a material cost. Replacing one pressure with another does not abolish limits. It displaces them. A global economy in permanent growth eventually puts all alternatives under pressure at the same time.

Substitution can be necessary. But it cannot save the principle of infinite growth. In a finite world, there is no infinite material escape route.

From resource crisis to civilizational crisis

It would be too narrow to say that infinite growth is impossible because resources will simply run out. The argument is deeper. Some resources will not disappear tomorrow. Some will be recycled. Some technologies will bring real gains. But none of this solves the central problem: an economy that must grow without end necessarily increases its global pressure on the living world.

Infinite growth requires the impossible: infinite resources, indefinitely available energy, unlimited carbon sinks, indestructible soils, always accessible freshwater, ever-concentrated minerals and ecosystems able to absorb our waste forever.

None of these assumptions is real. The twenty-first century will therefore have to choose between two forms of degrowth: one suffered, chaotic and unequal; or one chosen, democratic and selective, reducing destructive activities while protecting essential needs, public services, ecosystems and human dignity.

The real debate is no longer between growth and degrowth. It is between disorderly collapse and organized landing.

Toward an economy of robustness

Leaving the myth of infinite growth behind does not mean generalized impoverishment. It means moving from an economy of accumulation to an economy of robustness. A robust economy does not seek to produce ever more. It seeks to preserve the conditions for a good life in a limited world.

It measures success not by the volume of commodities produced but by the quality of social bonds, the health of ecosystems, food security, energy resilience, material sufficiency, social justice, climate stability and the capacity of the living world to regenerate.

This is the rupture defended by Debunk’Onomy: the ecological crisis is not only technical. It is monetary, economic, cultural and anthropological. As long as money, finance and accounting reward extraction, speed, debt, short-term profitability and accumulation, they will mechanically push societies beyond planetary boundaries.

It is not enough to green growth. We must change the very purpose of the economy: no longer to grow for growth’s sake, but to preserve, regenerate, balance and transmit. Infinite growth is impossible; robustness can become our new horizon. That horizon has a name: the economy of equilibrium.