Brain Candy

In “Collapse, medical ” Jared Diamond shows how societies destroy themselves.


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.

The story of the Eastern and Western Settlements of Greenland is told in Jared Diamond’s “Collapse: How Societies Choose to Fail or Succeed” (Viking; $29.95). Diamond teaches geography at U.C.L.A. and is well known for his best-seller “Guns, Germs, and Steel,” which won a Pulitzer Prize. In “Guns, Germs, and Steel,” Diamond looked at environmental and structural factors to explain why Western societies came to dominate the world. In “Collapse,” he continues that approach, only this time he looks at history’s losers—like the Easter Islanders, the Anasazi of the American Southwest, the Mayans, and the modern-day Rwandans. We live in an era preoccupied with the way that ideology and culture and politics and economics help shape the course of history. But Diamond isn’t particularly interested in any of those things—or, at least, he’s interested in them only insofar as they bear on what to him is the far more important question, which is a society’s relationship to its climate and geography and resources and neighbors. “Collapse” is a book about the most prosaic elements of the earth’s ecosystem—soil, trees, and water—because societies fail, in Diamond’s view, when they mismanage those environmental factors.

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’s argument stands in sharp contrast to the conventional explanations for a society’s collapse. Usually, we look for some kind of cataclysmic event. The aboriginal civilization of the Americas was decimated by the sudden arrival of smallpox. European Jewry was destroyed by Nazism. Similarly, the disappearance of the Norse settlements is usually blamed on the Little Ice Age, which descended on Greenland in the early fourteen-hundreds, ending several centuries of relative warmth. (One archeologist refers to this as the “It got too cold, and they died” argument.) What all these explanations have in common is the idea that civilizations are destroyed by forces outside their control, by acts of God.

But look, Diamond says, at Easter Island. Once, it was home to a thriving culture that produced the enormous stone statues that continue to inspire awe. It was home to dozens of species of trees, which created and protected an ecosystem fertile enough to support as many as thirty thousand people. Today, it’s a barren and largely empty outcropping of volcanic rock. What happened? Did a rare plant virus wipe out the island’s forest cover? Not at all. The Easter Islanders chopped their trees down, one by one, until they were all gone. “I have often asked myself, ‘What did the Easter Islander who cut down the last palm tree say while he was doing it?'” Diamond writes, and that, of course, is what is so troubling about the conclusions of “Collapse.” Those trees were felled by rational actors—who must have suspected that the destruction of this resource would result in the destruction of their civilization. The lesson of “Collapse” is that societies, as often as not, aren’t murdered. They commit suicide: they slit their wrists and then, in the course of many decades, stand by passively and watch themselves bleed to death.

This doesn’t mean that acts of God don’t play a role. It did get colder in Greenland in the early fourteen-hundreds. But it didn’t get so cold that the island became uninhabitable. The Inuit survived long after the Norse died out, and the Norse had all kinds of advantages, including a more diverse food supply, iron tools, and ready access to Europe. The problem was that the Norse simply couldn’t adapt to the country’s changing environmental conditions. 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.” He goes on:

To us in our secular modern society, the predicament in which the Greenlanders found themselves is difficult to fathom. To them, however, concerned with their social survival as much as their biological survival, it was out of the question to invest less in churches, to imitate or intermarry with the Inuit, and thereby to face an eternity in Hell just in order to survive another winter on Earth.

Diamond’s distinction between social and biological survival is a critical one, because too often we blur the two, or assume that biological survival is contingent on the strength of our civilizational values. That was the lesson taken from the two world wars and the nuclear age that followed: we would survive as a species only if we learned to get along and resolve our disputes peacefully. The fact is, though, that we can be law-abiding and peace-loving and tolerant and inventive and committed to freedom and true to our own values and still behave in ways that are biologically suicidal. The two kinds of survival are separate.

Diamond points out that the Easter Islanders did not practice, so far as we know, a uniquely pathological version of South Pacific culture. Other societies, on other islands in the Hawaiian archipelago, chopped down trees and farmed and raised livestock just as the Easter Islanders did. What doomed the Easter Islanders was the interaction between what they did and where they were. Diamond and a colleague, Barry Rollet, identified nine physical factors that contributed to the likelihood of deforestation—including latitude, average rainfall, aerial-ash fallout, proximity to Central Asia’s dust plume, size, and so on—and Easter Island ranked at the high-risk end of nearly every variable. “The reason for Easter’s unusually severe degree of deforestation isn’t that those seemingly nice people really were unusually bad or improvident,” he concludes. “Instead, they had the misfortune to be living in one of the most fragile environments, at the highest risk for deforestation, of any Pacific people.” The problem wasn’t the Easter Islanders. It was Easter Island.

In the second half of “Collapse,” Diamond turns his attention to modern examples, and one of his case studies is the recent genocide in Rwanda. What happened in Rwanda is commonly described as an ethnic struggle between the majority Hutu and the historically dominant, wealthier Tutsi, and it is understood in those terms because that is how we have come to explain much of modern conflict: Serb and Croat, Jew and Arab, Muslim and Christian. The world is a cauldron of cultural antagonism. It’s an explanation that clearly exasperates Diamond. The Hutu didn’t just kill the Tutsi, he points out. The Hutu also killed other Hutu. Why? Look at the land: steep hills farmed right up to the crests, without any protective terracing; rivers thick with mud from erosion; extreme deforestation leading to irregular rainfall and famine; staggeringly high population densities; the exhaustion of the topsoil; falling per-capita food production. This was a society on the brink of ecological disaster, and if there is anything that is clear from the study of such societies it is that they inevitably descend into genocidal chaos. In “Collapse,” Diamond quite convincingly defends himself against the charge of environmental determinism. His discussions are always nuanced, and he gives political and ideological factors their due. The real issue is how, in coming to terms with the uncertainties and hostilities of the world, the rest of us have turned ourselves into cultural determinists.


For the past thirty years, Oregon has had one of the strictest sets of land-use regulations in the nation, requiring new development to be clustered in and around existing urban development. The laws meant that Oregon has done perhaps the best job in the nation in limiting suburban sprawl, and protecting coastal lands and estuaries. But this November Oregon’s voters passed a ballot referendum, known as Measure 37, that rolled back many of those protections. Specifically, Measure 37 said that anyone who could show that the value of his land was affected by regulations implemented since its purchase was entitled to compensation from the state. If the state declined to pay, the property owner would be exempted from the regulations.

To call Measure 37—and similar referendums that have been passed recently in other states—intellectually incoherent is to put it mildly. It might be that the reason your hundred-acre farm on a pristine hillside is worth millions to a developer is that it’s on a pristine hillside: if everyone on that hillside could subdivide, and sell out to Target and Wal-Mart, then nobody’s plot would be worth millions anymore. Will the voters of Oregon then pass Measure 38, allowing them to sue the state for compensation over damage to property values caused by Measure 37?

It is hard to read “Collapse,” though, and not have an additional reaction to Measure 37. Supporters of the law spoke entirely in the language of political ideology. To them, the measure was a defense of property rights, preventing the state from unconstitutional “takings.” If you replaced the term “property rights” with “First Amendment rights,” this would have been indistinguishable from an argument over, say, whether charitable groups ought to be able to canvass in malls, or whether cities can control the advertising they sell on the sides of public buses. As a society, we do a very good job with these kinds of debates: we give everyone a hearing, and pass laws, and make compromises, and square our conclusions with our constitutional heritage—and in the Oregon debate the quality of the theoretical argument was impressively high.

The thing that got lost in the debate, however, was the land. In a rapidly growing state like Oregon, what, precisely, are the state’s ecological strengths and vulnerabilities? What impact will changed land-use priorities have on water and soil and cropland and forest? One can imagine Diamond writing about the Measure 37 debate, and he wouldn’t be very impressed by how seriously Oregonians wrestled with the problem of squaring their land-use rules with their values, because to him a society’s environmental birthright is not best discussed in those terms. Rivers and streams and forests and soil are a biological resource. They are a tangible, finite thing, and societies collapse when they get so consumed with addressing the fine points of their history and culture and deeply held beliefs—with making sure that Thorstein Olafsson and Sigrid Bjornsdotter are married before the right number of witnesses following the announcement of wedding banns on the right number of Sundays—that they forget that the pastureland is shrinking and the forest cover is gone.

When archeologists looked through the ruins of the Western Settlement, they found plenty of the big wooden objects that were so valuable in Greenland—crucifixes, bowls, furniture, doors, roof timbers—which meant that the end came too quickly for anyone to do any scavenging. And, when the archeologists looked at the animal bones left in the debris, they found the bones of newborn calves, meaning that the Norse, in that final winter, had given up on the future. They found toe bones from cows, equal to the number of cow spaces in the barn, meaning that the Norse ate their cattle down to the hoofs, and they found the bones of dogs covered with knife marks, meaning that, in the end, they had to eat their pets. But not fish bones, of course. Right up until they starved to death, the Norse never lost sight of what they stood for.
Is pop culture dumbing us down or smartening us up?


Twenty years ago, sildenafil a political philosopher named James Flynn uncovered a curious fact. Americans—at least, sickness as measured by I.Q. tests—were getting smarter. This fact had been obscured for years, because the people who give I.Q. tests continually recalibrate the scoring system to keep the average at 100. But if you took out the recalibration, Flynn found, I.Q. scores showed a steady upward trajectory, rising by about three points per decade, which means that a person whose I.Q. placed him in the top ten per cent of the American population in 1920 would today fall in the bottom third. Some of that effect, no doubt, is a simple by-product of economic progress: in the surge of prosperity during the middle part of the last century, people in the West became better fed, better educated, and more familiar with things like I.Q. tests. But, even as that wave of change has subsided, test scores have continued to rise—not just in America but all over the developed world. What’s more, the increases have not been confined to children who go to enriched day-care centers and private schools. The middle part of the curve—the people who have supposedly been suffering from a deteriorating public-school system and a steady diet of lowest-common-denominator television and mindless pop music—has increased just as much. What on earth is happening? In the wonderfully entertaining “Everything Bad Is Good for You” (Riverhead; $23.95), Steven Johnson proposes that what is making us smarter is precisely what we thought was making us dumber: popular culture.

Johnson is the former editor of the online magazine Feed and the author of a number of books on science and technology. There is a pleasing eclecticism to his thinking. He is as happy analyzing “Finding Nemo” as he is dissecting the intricacies of a piece of software, and he’s perfectly capable of using Nietzsche’s notion of eternal recurrence to discuss the new creative rules of television shows. Johnson wants to understand popular culture—not in the postmodern, academic sense of wondering what “The Dukes of Hazzard” tells us about Southern male alienation but in the very practical sense of wondering what watching something like “The Dukes of Hazzard” does to the way our minds work.

As Johnson points out, television is very different now from what it was thirty years ago. It’s harder. A typical episode of “Starsky and Hutch,” in the nineteen-seventies, followed an essentially linear path: two characters, engaged in a single story line, moving toward a decisive conclusion. To watch an episode of “Dallas” today is to be stunned by its glacial pace—by the arduous attempts to establish social relationships, by the excruciating simplicity of the plotline, by how obvious it was. A single episode of “The Sopranos,” by contrast, might follow five narrative threads, involving a dozen characters who weave in and out of the plot. Modern television also requires the viewer to do a lot of what Johnson calls “filling in,” as in a “Seinfeld” episode that subtly parodies the Kennedy assassination conspiracists, or a typical “Simpsons” episode, which may contain numerous allusions to politics or cinema or pop culture. The extraordinary amount of money now being made in the television aftermarket—DVD sales and syndication—means that the creators of television shows now have an incentive to make programming that can sustain two or three or four viewings. Even reality shows like “Survivor,” Johnson argues, engage the viewer in a way that television rarely has in the past:

When we watch these shows, the part of our brain that monitors the emotional lives of the people around us—the part that tracks subtle shifts in intonation and gesture and facial expression—scrutinizes the action on the screen, looking for clues. . . . The phrase “Monday-morning quarterbacking” was coined to describe the engaged feeling spectators have in relation to games as opposed to stories. We absorb stories, but we second-guess games. Reality programming has brought that second-guessing to prime time, only the game in question revolves around social dexterity rather than the physical kind.

How can the greater cognitive demands that television makes on us now, he wonders, not matter?

Johnson develops the same argument about video games. Most of the people who denounce video games, he says, haven’t actually played them—at least, not recently. Twenty years ago, games like Tetris or Pac-Man were simple exercises in motor coördination and pattern recognition. Today’s games belong to another realm. Johnson points out that one of the “walk-throughs” for “Grand Theft Auto III”—that is, the informal guides that break down the games and help players navigate their complexities—is fifty-three thousand words long, about the length of his book. The contemporary video game involves a fully realized imaginary world, dense with detail and levels of complexity.

Indeed, video games are not games in the sense of those pastimes—like Monopoly or gin rummy or chess—which most of us grew up with. They don’t have a set of unambiguous rules that have to be learned and then followed during the course of play. This is why many of us find modern video games baffling: we’re not used to being in a situation where we have to figure out what to do. We think we only have to learn how to press the buttons faster. But these games withhold critical information from the player. Players have to explore and sort through hypotheses in order to make sense of the game’s environment, which is why a modern video game can take forty hours to complete. Far from being engines of instant gratification, as they are often described, video games are actually, Johnson writes, “all about delayed gratification—sometimes so long delayed that you wonder if the gratification is ever going to show.”

At the same time, players are required to manage a dizzying array of information and options. The game presents the player with a series of puzzles, and you can’t succeed at the game simply by solving the puzzles one at a time. You have to craft a longer-term strategy, in order to juggle and coördinate competing interests. In denigrating the video game, Johnson argues, we have confused it with other phenomena in teen-age life, like multitasking—simultaneously e-mailing and listening to music and talking on the telephone and surfing the Internet. Playing a video game is, in fact, an exercise in “constructing the proper hierarchy of tasks and moving through the tasks in the correct sequence,” he writes. “It’s about finding order and meaning in the world, and making decisions that help create that order.”


It doesn’t seem right, of course, that watching “24” or playing a video game could be as important cognitively as reading a book. Isn’t the extraordinary success of the “Harry Potter” novels better news for the culture than the equivalent success of “Grand Theft Auto III”? Johnson’s response is to imagine what cultural critics might have said had video games been invented hundreds of years ago, and only recently had something called the book been marketed aggressively to children:

Reading books chronically understimulates the senses. Unlike the longstanding tradition of game playing—which engages the child in a vivid, three-dimensional world filled with moving images and musical sound-scapes, navigated and controlled with complex muscular movements—books are simply a barren string of words on the page. . . .
Books are also tragically isolating. While games have for many years engaged the young in complex social relationships with their peers, building and exploring worlds together, books force the child to sequester him or herself in a quiet space, shut off from interaction with other children. . . .
But perhaps the most dangerous property of these books is the fact that they follow a fixed linear path. You can’t control their narratives in any fashion—you simply sit back and have the story dictated to you. . . . This risks instilling a general passivity in our children, making them feel as though they’re powerless to change their circumstances. Reading is not an active, participatory process; it’s a submissive one.

He’s joking, of course, but only in part. The point is that books and video games represent two very different kinds of learning. When you read a biology textbook, the content of what you read is what matters. Reading is a form of explicit learning. When you play a video game, the value is in how it makes you think. Video games are an example of collateral learning, which is no less important.

Being “smart” involves facility in both kinds of thinking—the kind of fluid problem solving that matters in things like video games and I.Q. tests, but also the kind of crystallized knowledge that comes from explicit learning. If Johnson’s book has a flaw, it is that he sometimes speaks of our culture being “smarter” when he’s really referring just to that fluid problem-solving facility. When it comes to the other kind of intelligence, it is not clear at all what kind of progress we are making, as anyone who has read, say, the Gettysburg Address alongside any Presidential speech from the past twenty years can attest. The real question is what the right balance of these two forms of intelligence might look like. “Everything Bad Is Good for You” doesn’t answer that question. But Johnson does something nearly as important, which is to remind us that we shouldn’t fall into the trap of thinking that explicit learning is the only kind of learning that matters.

In recent years, for example, a number of elementary schools have phased out or reduced recess and replaced it with extra math or English instruction. This is the triumph of the explicit over the collateral. After all, recess is “play” for a ten-year-old in precisely the sense that Johnson describes video games as play for an adolescent: an unstructured environment that requires the child actively to intervene, to look for the hidden logic, to find order and meaning in chaos.

One of the ongoing debates in the educational community, similarly, is over the value of homework. Meta-analysis of hundreds of studies done on the effects of homework shows that the evidence supporting the practice is, at best, modest. Homework seems to be most useful in high school and for subjects like math. At the elementary-school level, homework seems to be of marginal or no academic value. Its effect on discipline and personal responsibility is unproved. And the causal relation between high-school homework and achievement is unclear: it hasn’t been firmly established whether spending more time on homework in high school makes you a better student or whether better students, finding homework more pleasurable, spend more time doing it. So why, as a society, are we so enamored of homework? Perhaps because we have so little faith in the value of the things that children would otherwise be doing with their time. They could go out for a walk, and get some exercise; they could spend time with their peers, and reap the rewards of friendship. Or, Johnson suggests, they could be playing a video game, and giving their minds a rigorous workout.