Metabolic Rift: dynamics of resource depletion

June 28, 2026

The study by John Bellamy Foster of Marx's analysis of the transformation from agrarian feudal to urban bourgeois society leads him to conceptualize a socioecological dynamic named metabolic rift. The displacement of a great part of the population from the rural areas to the interior of the walled burgs requires that the fruits of the earth produced in the former be transported to the latter, in order to feed their dwellers–a necessary condition for the manufacturing work. Meaning that, with each harvest, nutrients, e.g. potassium, phosphorus, nitrogen, are subtracted from the farms and transported to the city. But these mineral and organic elements never return to the earth, therefore causing a rift in the natural cycle. After being processed by the intestines of the townsfolk, transformed into matter with the potential to fertilize and restore vitality to the soil, the human rejects are instead thrown on the streets and sewers. Instead of the virtuous circle of life, we have dearth of the soil in the country and accumulated waste in the city.

Food, as a positive energy source for the active life of men and women of the city, carries in its development a negative principle, the subtraction of nutrients from the earth's bosom. The rift occurs because, differently from the previous historical period, when the overwhelming majority of the population lived in the rural lands, now the positive and negative moments of the natural cycle occur in different locations, introducing an imbalance. The anabolism of human beings in the city, because the matter does not return to its origin, is unable to compensate for the catabolism of the soil.

"Capitalist production, by collecting the population in great centres, and causing an ever-increasing preponderance of town population, on the one hand concentrates the historical motive power of society; on the other hand, it disturbs the circulation of matter between man and the soil, i.e. prevents the return to the soil of its elements consumed by man in the form of food and clothing; it therefore violates the conditions necessary to the lasting fertility of the soil" (Marx, Capital, Vol. I, Ch. 15, §10).

The bourgeois revolutions entail the transition from agrarian to urban society. This transformation of social relations of production is also a transformation of the human relation with the physical space and its constitutive matter: steel and concrete substitute wood and earth as the physical elements that build the locus vivendi. In this process, the ancient balance between humans and nature is irrevocably destabilized. The metabolic rift exposes the contradictions in the interactions of humans with nature, and contributes, in the interior of the civil society, to the intensification of the antagonism between the city and the country folk, with political repercussions. Workers of the urban and agrarian industries, exploited by the same dynamic of wage work, constitute even today separate classes, proletariat and peasantry, with distinct interests. The dynamic that depletes the earth of its nutrients to feed the city dwellers imposes a hard challenge to the unification of rural and urban working classes in the direction of a social transformation that could solve this crisis that affects both parties.

The old patriarch of French letters clearly had in mind this antinomy of agriculture and the urban industrial society, when he interrupted his great novel to advance a long and melancholy exposition about l'égout de Paris and the rich bounty of organic matter that was wasted every day in the constant flow from the city to the sea. Addressing the bourgeoisie, he classified this as le chef-d’œuvre de votre ignorance.

Those heaps of refuse at the street corners, those cartloads of muck jolted through the streets at night, those hideous sanitation barrels, those fetid flows of underground filth hidden from view by the paving stones—do you know what they are? They are flowering meadows, green grass, wild thyme and sage; they are game and livestock; the contented bellowing of great oxen at evening; fragrant hay and golden wheat; bread on your table and warm blood in your veins; they are health, joy, and life itself. Such is the will of that mysterious creation which is transformation on earth and transfiguration in heaven. (Victor Hugo, Les Misérables, Vol. V, Book 2, Ch. 1).

Victor Hugo described the Parisian sewer as a senseless waste of resources, sans aucun but, amounting to approximately twenty million per year. What does not enter the master poet's accounting, however, is that capitalism is not a system whose end is the optimal allocation of resources. Rather, its end is the accumulation of wealth, as industrial and commercial profits. The systemic failure caused by the metabolic rift creates a providential commercial opportunity in the form of a high demand by the agricultural industry for nutrients to fertilize the depleted soil. Enters capital to remedy the problem: the chemical industry introduces a large supply of new commodities: artificial fertilizers, sewage treatment products. Their manufacturing enables added surplus value appropriation in the cycle of food production.

Before the introduction of modern fertilizers, produced from the mineral extraction of enormous volumes of solid rock in the periphery of the global market, the damages to the soil caused by the metabolic rift were compensated by the use of guano, a solidified accumulation of bird excrement. British ships would cross the Atlantic to bring loads of this natural fertilizer harvested by slave labour in the Americas, to the enrichment of the European merchant class. This historical picture adds to the gallery of representations of the cannibal capitalism, which expropriates and exploits natural resources and human labour to feed its autophagous appetite.

Further reading