traditional city transition

A thousand years ago, a group of Vikings led by Erik the Red set sail from Norway for the vast Arctic landmass west of Scandinavia which came to be known as Greenland. It was largely uninhabitable—a forbidding expanse of snow and ice. But along the southwestern coast there were two deep fjords protected from the harsh winds and saltwater spray of the North Atlantic Ocean, and as the Norse sailed upriver they saw grassy slopes flowering with buttercups, dandelions, and bluebells, and thick forests of willow and birch and alder. Two colonies were formed, three hundred miles apart, known as the Eastern and Western Settlements. The Norse raised sheep, goats, and cattle. They turned the grassy slopes into pastureland. They hunted seal and caribou. They built a string of parish churches and a magnificent cathedral, the remains of which are still standing. They traded actively with mainland Europe, and tithed regularly to the Roman Catholic Church. The Norse colonies in Greenland were law-abiding, economically viable, fully integrated communities, numbering at their peak five thousand people. They lasted for four hundred and fifty years—and then they vanished. ...

There was nothing wrong with the social organization of the Greenland settlements. The Norse built a functioning reproduction of the predominant northern-European civic model of the time—devout, structured, and reasonably orderly. In 1408, right before the end, records from the Eastern Settlement dutifully report that Thorstein Olafsson married Sigrid Bjornsdotter in Hvalsey Church on September 14th of that year, with Brand Halldorstson, Thord Jorundarson, Thorbjorn Bardarson, and Jon Jonsson as witnesses, following the proclamation of the wedding banns on three consecutive Sundays.

The problem with the settlements, Diamond argues, was that the Norse thought that Greenland really was green; they treated it as if it were the verdant farmland of southern Norway. They cleared the land to create meadows for their cows, and to grow hay to feed their livestock through the long winter. They chopped down the forests for fuel, and for the construction of wooden objects. To make houses warm enough for the winter, they built their homes out of six-foot-thick slabs of turf, which meant that a typical home consumed about ten acres of grassland.

But Greenland’s ecosystem was too fragile to withstand that kind of pressure. The short, cool growing season meant that plants developed slowly, which in turn meant that topsoil layers were shallow and lacking in soil constituents, like organic humus and clay, that hold moisture and keep soil resilient in the face of strong winds. “The sequence of soil erosion in Greenland begins with cutting or burning the cover of trees and shrubs, which are more effective at holding soil than is grass,” he writes. “With the trees and shrubs gone, livestock, especially sheep and goats, graze down the grass, which regenerates only slowly in Greenland’s climate. Once the grass cover is broken and the soil is exposed, soil is carried away especially by the strong winds, and also by pounding from occasionally heavy rains, to the point where the topsoil can be removed for a distance of miles from an entire valley.” Without adequate pastureland, the summer hay yields shrank; without adequate supplies of hay, keeping livestock through the long winter got harder. And, without adequate supplies of wood, getting fuel for the winter became increasingly difficult.

The Norse needed to reduce their reliance on livestock—particularly cows, which consumed an enormous amount of agricultural resources. But cows were a sign of high status; to northern Europeans, beef was a prized food. They needed to copy the Inuit practice of burning seal blubber for heat and light in the winter, and to learn from the Inuit the difficult art of hunting ringed seals, which were the most reliably plentiful source of food available in the winter. But the Norse had contempt for the Inuit—they called them skraelings, “wretches”—and preferred to practice their own brand of European agriculture. In the summer, when the Norse should have been sending ships on lumber-gathering missions to Labrador, in order to relieve the pressure on their own forestlands, they instead sent boats and men to the coast to hunt for walrus. Walrus tusks, after all, had great trade value. In return for those tusks, the Norse were able to acquire, among other things, church bells, stained-glass windows, bronze candlesticks, Communion wine, linen, silk, silver, churchmen’s robes, and jewelry to adorn their massive cathedral at Gardar, with its three-ton sandstone building blocks and eighty-foot bell tower. In the end, the Norse starved to death. ...

Diamond writes, for instance, of the fact that nobody can find fish remains in Norse archeological sites. One scientist sifted through tons of debris from the Vatnahverfi farm and found only three fish bones; another researcher analyzed thirty-five thousand bones from the garbage of another Norse farm and found two fish bones. How can this be? Greenland is a fisherman’s dream: Diamond describes running into a Danish tourist in Greenland who had just caught two Arctic char in a shallow pool with her bare hands. “Every archaeologist who comes to excavate in Greenland . . . starts out with his or her own idea about where all those missing fish bones might be hiding,” he writes. “Could the Norse have strictly confined their munching on fish to within a few feet of the shoreline, at sites now underwater because of land subsidence? Could they have faithfully saved all their fish bones for fertilizer, fuel, or feeding to cows?” It seems unlikely. There are no fish bones in Norse archeological remains, Diamond concludes, for the simple reason that the Norse didn’t eat fish. For one reason or another, they had a cultural taboo against it.

Given the difficulty that the Norse had in putting food on the table, this was insane. Eating fish would have substantially reduced the ecological demands of the Norse settlements. The Norse would have needed fewer livestock and less pastureland. Fishing is not nearly as labor-intensive as raising cattle or hunting caribou, so eating fish would have freed time and energy for other activities. It would have diversified their diet.

Why did the Norse choose not to eat fish? Because they weren’t thinking about their biological survival. They were thinking about their cultural survival. Food taboos are one of the idiosyncrasies that define a community. Not eating fish served the same function as building lavish churches, and doggedly replicating the untenable agricultural practices of their land of origin. It was part of what it meant to be Norse, and if you are going to establish a community in a harsh and forbidding environment all those little idiosyncrasies which define and cement a culture are of paramount importance. “The Norse were undone by the same social glue that had enabled them to master Greenland’s difficulties,” Diamond writes. “The values to which people cling most stubbornly under inappropriate conditions are those values that were previously the source of their greatest triumphs over adversity.”