Agriculture back then made the landscape more diverse
For millennia, the relationship between human cultivation and the natural world was not one of destruction but of diversification — a truth buried in Swiss soil and now recovered through pollen. A study spanning 7,600 years reveals that early farmers, by fragmenting land into varied habitats, actually enriched plant diversity rather than diminishing it. Only the great social ruptures — migrations, plagues — broke that pattern. The finding asks us to reconsider not whether humans should farm, but how the industrialization of farming severed an ancient, generative compact with the land.
- A foundational assumption of modern environmentalism — that human agriculture inherently harms biodiversity — has been directly challenged by 7,600 years of pollen evidence from Switzerland.
- Researchers dated 227 pollen samples to the decade, constructing a timeline precise enough to show that biodiversity declined not when farming expanded, but when societies collapsed.
- Early farmers created mosaic landscapes of fields, pastures, forests, and margins that supported greater plant variety than the untouched land before them — a counterintuitive reversal of the expected narrative.
- Modern industrial agriculture, with its monocultures and pesticides, emerges from this study not as the inevitable endpoint of farming but as a specific and correctable departure from a historically richer model.
- The research now points toward a practical question: whether redesigning contemporary agriculture around landscape heterogeneity could restore biodiversity while still sustaining a global food system.
A team of scientists has overturned a widely held assumption: that human farming has always been harmful to nature. By analyzing pollen preserved in Swiss soil across 7,600 years, they found that early agriculture actually increased plant diversity — not by simplifying the landscape, but by breaking it into a mosaic of fields, pastures, forests, and margins, each sustaining its own plant communities. The study, published in Nature Communications, was built on 227 radiocarbon-dated pollen samples from the Swiss Plateau, each pinpointed to within a decade of its deposition.
Lead author Dr. Fabian Rey of the University of Basel's Geoecology Research Group noted that the results require a fundamental shift in perspective. Biodiversity did decline at certain moments in the record — but those moments corresponded to social crises like population migrations and plagues, not to the expansion of farming itself. Ancient farmers worked smaller plots, preserved hedgerows and forest edges, and left the land structurally varied in ways that supported botanical richness.
The study does not excuse modern agriculture from its well-documented environmental harms. Instead, it draws a distinction between farming as a practice and farming as it has been industrialized. The problem, the research implies, is intensification and monoculture — not cultivation itself. If early farmers enhanced diversity through heterogeneity, the question becomes whether contemporary agriculture can be redesigned along similar principles, restoring varied habitats while still meeting the demands of a global population. That possibility now sits at the center of the conversation.
A team of scientists has upended a comfortable assumption: that human farming has always been bad for nature. By studying pollen trapped in Swiss soil for the past 7,600 years, researchers found that early agriculture actually increased plant diversity, creating a patchwork of different habitats across the landscape. The finding, published in Nature Communications, suggests that the relationship between farming and biodiversity is more complicated than modern experience would lead us to believe.
The research centered on the Swiss Plateau, where scientists extracted and analyzed pollen samples with remarkable precision. Using radiocarbon dating, they pinpointed the age of 227 samples down to the decade they were deposited, building a detailed timeline of how the landscape changed as humans began to farm. What emerged was a counterintuitive story: as agriculture spread across the region, it didn't simplify the environment into monoculture. Instead, it fragmented the land into a mosaic of different habitats—cultivated fields, pastures, forests, and margins—each supporting its own community of plants.
Dr. Fabian Rey, the lead author and laboratory manager at the University of Basel's Geoecology Research Group, explained the shift in thinking required to understand these results. "You might assume human activity must harm plant diversity, because that's what we observe now," he said. "But agriculture in those early periods made the landscape more diverse. As farming expanded, a mosaic of habitats emerged over time." The researchers did find moments when plant diversity declined sharply—during major crises like population migrations or plagues—but these were exceptions driven by social upheaval rather than farming itself.
The implications cut against the grain of contemporary environmental discourse. Modern agriculture has become synonymous with biodiversity loss: monoculture crops, pesticides, habitat destruction. Yet this study suggests that farming, in its earlier forms, operated differently. Ancient farmers did not clear vast tracts for single crops. They worked smaller plots, left margins and hedgerows, allowed forests to persist alongside fields. The result was a landscape more diverse, botanically speaking, than what preceded it.
This research arrives at a moment when agriculture is routinely blamed for accelerating climate change and degrading ecosystems. The study does not absolve modern farming of responsibility for those harms. Rather, it suggests that the problem is not farming itself but how farming has been industrialized and intensified. Understanding how early agriculture enhanced diversity—through landscape heterogeneity rather than simplification—could inform efforts to redesign modern systems. If ancient farmers created richer plant communities by maintaining varied habitats, perhaps contemporary agriculture could move in a similar direction, restoring diversity while still feeding a global population. The question now is whether that knowledge will reshape how we farm.
Notable Quotes
Agriculture back then made the landscape more diverse. As agriculture expanded, a mosaic of habitats emerged over time.— Dr. Fabian Rey, University of Basel
The Hearth Conversation Another angle on the story
So the study found that ancient farming actually helped plant diversity. How does that square with what we know about modern agriculture destroying habitats?
The difference is in the scale and intensity. Ancient farmers worked smaller plots and left a lot of the landscape untouched. That created a patchwork—some fields, some forest, some pasture. Modern agriculture clears vast areas for single crops, which is a completely different thing.
But why would a patchwork of farms increase diversity? Wouldn't clearing any land for farming reduce the plants that were there before?
It does reduce some plants, but it creates opportunities for others. When you have varied habitats next to each other, you get more total diversity. A field margin supports different plants than a forest interior. The key is the variety, not the absence of human activity.
The study looked at 7,600 years of pollen. Did diversity stay high the whole time, or did it fluctuate?
It fluctuated. The researchers found that biodiversity actually declined during major crises—migrations, plagues—when human activity was disrupted. That suggests the farming itself wasn't the problem. The problem was when the system broke down.
So what does this mean for how we farm now? Are you saying we should go back to ancient methods?
Not exactly. It's more that we should learn from the principle: diversity in the landscape supports diversity in plants. Modern agriculture could incorporate that—keeping hedgerows, varying crops, leaving margins. The ancient farmers weren't trying to be conservationists. They just happened to create conditions where more plants could thrive.