What if the way we grow food is the single greatest threat to the planet's future — and the solution requires giving up almost everything we think we know about farming?

That is the question Monbiot forces onto the table, and he doesn't flinch from where it leads. Industrial animal agriculture, he argues, is not just harmful — it is among the most destructive forces on the planet, devastating biodiversity, exhausting soils, and consuming land on a scale that makes most other environmental damage look marginal. His proposed alternative — replacing conventional farming with precision fermentation and lab-grown proteins — will make almost everyone uncomfortable.

The comparison Monbiot invites, by way of Rachel Carson, is instructive — though not quite in the way he intends. Carson's Silent Spring (1962) was an empirical intervention: here is harm that is happening, documented, measurable, traceable to specific compounds applied in specific ways. Her task was to show what was wrong. The argument was complete once the evidence was assembled. Monbiot's task in Regenesis is structurally different. He must show both what is wrong — which he does, convincingly — and that something workable can replace it. Carson needed only to be right about the diagnosis. Monbiot needs to be right about the diagnosis and about the cure, and the cure does not yet exist in the form his argument requires. Precision fermentation can produce proteins with a fraction of the land and water footprint of conventional agriculture. At laboratory and early industrial scale, the evidence is compelling. Whether it can be produced at the volume, at the price, and with the energy inputs that global food systems require is a different question, and Regenesis is more confident about the answer than the current state of the technology justifies.

The main difficulty is not technological. It is behavioural, and it is nearly intractable. Monbiot's vision requires that a meaningful proportion of the human population be willing to replace food — understood as something grown, raised, prepared, culturally embedded, emotionally loaded — with what is, whatever its nutritional profile, a manufactured substrate. Food is not fuel. It is one of the primary sites through which people enact identity, maintain ritual, express care, negotiate belonging, and connect to memory and community. The evidence that industrial animal agriculture is ecologically catastrophic does not dissolve any of this. People have known for decades that their food choices carry environmental consequences, and the aggregate effect on behaviour has been modest at best. The fraction of the global population that would consider replacing meat, dairy, and conventional produce with precision-fermented alternatives — not as a supplement, not as an occasional novelty, but as a structural shift in what eating means — is not a rounding error. It is a vanishingly small constituency. This is not a marketing problem. It is not solvable by better communication of the evidence, though Monbiot communicates it better than almost anyone. It is a structural problem with any solution that requires people to stop caring about what food is, not just what it does.

What survives this critique is significant. The land argument — that radically reducing the footprint of protein production would liberate vast areas currently devoted to grazing and feed crops, allowing genuine rewilding at a scale that could meaningfully address both biodiversity issues and carbon sequestration.

What survives this critique is significant, and perhaps more so than Monbiot himself intends. The land argument — that radically reducing the footprint of protein production would liberate vast areas currently devoted to grazing and feed crops, allowing rewilding at a scale that could meaningfully address both biodiversity issues and carbon sequestration — does not depend on precision fermentation delivering everything the book asks of it. Radical ideas rarely win by being adopted wholesale. They win by shifting what is thinkable, by making previously unavailable options visible. If even a fraction of what Regenesis argues finds its way into policy, into investment, into how the next generation of food systems is designed, the consequences could be significant in ways that are difficult to anticipate from where we stand now.