Book review: Triumph of the City
Triumph of the City, by Edward Glaeser, is a thrilling and very readable hymn of praise to an invention so vast and so effective that it is generally taken for granted. More than half the global population already live in urban areas and within twenty years, five million more will flood into the cities of the developed and developing worlds. The crowds and pollution and noise that choke modern cities may horrify us. They shouldn't, says Glaeser: they are signs of growth, energy, and aspiration. Cities are our best and brightest hope.
This idea has had more than two hundred years of resistance. Not long after the Industrial Revolution began in Britain, the Romantic poets turned away from the smoke and factories of their cities to celebrate the air and light of untouched nature. In 19th-century America, the writer Henry David Thoreau retreated to the wilderness of Walden Pond to live the solitary, simple life, and succeeding generations of Americans had cities were bad and nature was good.
They had, Glaeser admits, a point. The early industrial cities were dirty, since they lacked efficient waste disposal systems, and diseases spread rapidly among the population. But more importantly they were profitable, and there were enormous commercial incentives to make them work, as well as political ones. Their transformation could be achieved at a stroke: in the second half of the 19th century, the French emperor Napoleon III gave Baron Haussmann unrestricted power to turn the slum-infested city of Paris into one of the wonders and delights of the modern world. Or the transformation could be done by trial and error. Glaeser has a brilliant account of the stop-start progression of New York. Its role as the 20th-century pole in this cultural and economic universe of the world. Either way, Paris, New York and other cities developed because they were the most effective markets for ideas and innovation.
For these and many other reasons, we should not be so upset by the spectacle of urban poverty. The poor flock to cities in the hope of becoming richer (which, by and large, they did). They also invigorate the economy of the city. This does not excuse them but they allow property prices to soar with unreasonable planning regulations. Instead, cities should build more houses and thereby hold property prices in check.
It can go wrong, of course. In Glaeser's view, this is primarily because municipal authorities fail to understand the principal virtues of cities. The heart of Paris, as many Parisians say, is turning into a museum because of attempts to preserve Baron Haussmann's 19th-century boulevards. Glaeser defends their preservation but argues that in the 1950s the French made a mistake in developing a huge high-rise, commercial area of La Défense on the outskirts of the city. He believes they should have revitalized the central area of Montparnasse into a new commercial district. This would have revived much of the city centre without destroying its fabric. In India, Mumbai could easily benefit from new areas of infill and the height restrictions could be relaxed by raising the limits presently imposed on the height of new constructions.
In America, it is the suburbs that have proved to be the real disaster. Glaeser is repentant on this subject himself. He moved to the suburbs when he had children. His entirely legitimate excuse is that the government made him (and millions like him) do it. By under-taxing petrol and imposing tight planning restrictions on inner cities, while forcing up the cost of property, it made flight to the suburbs more or less inevitable for the middle classes.
This is a disaster because nothing is more inefficient than a suburb. Suburbanites mingle less, and lose the face-to-face contact that makes being in cities so much more economically powerful. Houses are costlier to heat and cool than flats, and suburbanites drive thousands more miles per year than city dwellers. Every aspect of life involves more consumption. This leads to the strongest and newest argument in favour of cities—they are good for the environment. To live in the country or the suburbs is to have a vastly larger carbon footprint than an urban dweller.
Full of characters and accessible information, this is a tremendous book, not least because, like me, you will find yourself constantly seeking reasons to disagree. Like the poor in the city, this is a sign of success. If you hate the city and get moist-eyed at the thought of the country, then you are another, Glaeser is the man you will have to take on.
Tuatara
Tuatara are lizard-like reptiles, found only in New Zealand. They are representative of ancient life forms Tuatara are the only living representatives of an ancient lineage of reptiles called Sphenodontia, which is over 250 million years old. Because tuatara still look like fossils of reptiles that lived during the age of dinosaurs, they are often called living fossils. Now just two species of tuatara survive, and only in New Zealand. One is the Brothers Island tuatara which, until recent re-introductions to sanctuaries (safe places for wildlife), only survived on North Brother Island. The other species is the common tuatara, which survives on many other offshore islands. Although the tuatara species appear similar, they have genetic differences. Tuatara bones have been found in many parts of New Zealand. Where dated, they are usually a few hundred to 5,000 years old. It is not known whether these bones are from the two living species or other species that are now extinct.
Many anatomical features distinguish tuatara from other living reptiles - for example, they have a defining pattern of openings in the skull and a unique type of haemoglobin in the blood, and males have no external reproductive organ. Adults are between 30 and 75 centimetres long, and weigh between 250 and 1.200 grams. Males are larger than females, and have more developed spines in the crest along the neck, back and tail.
The male tuatara courts the female by approaching her with a proud walk. Tuatara mate in late summer, and the female usually lays 6-10 eggs the following spring, in a shallow nest at ground level. She may guard the nest for a few nights, then return to her burrow underground. The eggs incubate for about a year, so hatchlings emerge about the time that eggs are being laid the following season. Evidence indicates the gender of tuatara hatchlings is determined by both genetic and environmental factors. It is said that it is more likely for warmer eggs to produce male tuatara, and cooler eggs to produce females. The hatchlings receive no parental care and need to find their own food.
Tuatara live for a relatively long time, reaching reproductive maturity at about 15 years, and may breed for many decades. Their maximum lifespan is not known for certain, but many tuatara have reached 80 years still looking vigorous and healthy. Tuatara live in underground burrows and are more active at night, but will come out during the day to bask in the sun. Both sexes are territorial, and males aggressively defend their territory by posing and fighting if necessary. Teeth are their main weapons, and a bite can cause serious injury. Tuatara are carnivorous, eating invertebrates, lizards and the baby seabirds with which they often share burrows.
Tuatara were once widespread and abundant on the New Zealand mainland, but when Polynesian settlers arrived in New Zealand, in about 1250-1300 AD, they brought with them Pacific rats which killed tuatara. By the time of European settlement, in the 1840s, tuatara were almost extinct on the New Zealand mainland. Some islands provided temporary havens, but soon these too began to be invaded by rats and other mammalian predators.
Gradually tuatara became restricted to 32 nearshore islands. Many of these islands were tiny, some as small as only one hectare. A few, such as the Poor Knights common tuatara lives on islands off the north-eastern coast of New Zealand, and on some islands in Cook Strait. The Brothers Island tuatara survived only on the of the Brothers Island tuatara have been created on Titi Island in the Marlborough Sounds, and on Somes Island in Wellington Harbour.
Tuatara can live in remarkably dense populations. Most tuatara islands have 50-100 tuatara per square hectare - so an island of only 10 hectares may have a population of hundreds. Larger islands with many seabirds and invertebrates, which tuatara eat, may have greater densities. The largest population is on Stephens Island, where there are estimated to be as many as 2,500 per hectare in some places, and a total of at least 30,000. The total number of tuatara on all the islands is estimated to be between 50,000 and 100,000.
Legal protection, was granted to tuatara and the islands they occupied in 1895, but the reptiles continued to decline. Since then, active conservation management has reversed the decline, and new populations have become established on predator-free islands. In the mid-1980s the New Zealand Wildlife Service and its successor, the Department of Conservation, developed ways to eradicate rats from islands. Rats have now gone from almost all of the tuatara islands, making them safe for many threatened native species. In addition, the collection by conservationists of eggs for incubation in captivity, breeding in captivity, and moving tuatara to rat-free islands off the Northland coast, or Stephens Island in Cook Strait, were never invaded by rats, and had few of the other mammals that threaten native animals. The tiny, 4 hectare North Brother Island, in Cook Strait. However, two new populations free islands, have increased the number of islands that are inhabited by tuatara to 37. Many new tuatara populations are planned for islands and mainland reserves that have been freed of predators.
Flower Power
Why do people give flowers? To offer condolence to those who are grieving. To express gratitude. To ask for forgiveness. There is something undeniably powerful about giving flowers; in fact, few objects provoke such a universal response. In the US alone, the flower industry is now worth about $5bn a year—suggesting, at the very least, that they service a compelling human need.
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Research at the Department of Psychology at Rutgers State University of New Jersey confirms that flowers are unique among living organisms in their ability to induce changes in our emotional state. As the first part of their research, the Rutgers psychologists studied women in their homes. Each was presented with a variety of gifts such as flowers, fruit, or sweets. The women were unaware that the study was about the effect of gifts on their emotions. They were told that it was a study about their daily moods, and that they would receive a gift in return for taking part. Following the presentation of the gifts, women receiving flowers were assessed as displaying a much more positive mood than those who received other gifts, and this effect lasted for several days. After receiving flowers, participants were more willing to answer questions concerning their social circle and intimate relationships with friends and family. The results suggest that flowers influence our emotional behaviours, as well as having a strong effect on our immediate expression.
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In the second study, the psychologists observed participants being handed single flowers, or no gift at all, in a constrained and stressful situation—inside an elevator. Contrary to expectations regarding gender differences, both men and women presented with flowers were more likely to smile, to stand closer and to initiate conversation. Several subjects who were initially skeptical about the experiment's purpose then learnt that flowers were also being handed out, and returned to the elevator and demanded a flower. The scientists used elevators for this study precisely because typical behaviour in sparsely occupied elevators is for people to retreat to opposite corners. The subjects who received flowers, however, closed up that space to a considerable extent—indicating that the flowers not only induced a strong positive mood but brought a significant affiliation among people who had never previously met.
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The third study involved regularly sending flowers to a selected sample of men and women. The researchers found not only a profound elevation of mood but also reliable improvements in other measures of cognitive function, like memory. In this series of experiments, some participants produced such extraordinary emotional displays that the psychologists were totally unprepared for them. Subjects gave spontaneous hugs and kisses to the people who delivered the flowers, and sent invitations to the psychologists to come to their homes for refreshments.
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Various evolutionary hypotheses attempt to explain the remarkably powerful psychological effect of flowers. One is that our aesthetic preferences for fertile locations and growing things stem from prehistory, when these clues in our environment could mean the difference between starvation and survival. We may have become hardwired to respond positively to flowers because, for early man, finding them in a particular location predicted future food supplies and possibly a better place to rear children. Yet the flaw in this argument is that the showy flowers which humans seem to find most visually attractive are generally found on those plants which yield no edible products.
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The Rutgers psychologists' findings show that the various physical attributes of flowers combine to directly affect our emotions through multi-channel interactions. We have evolved preferences for the particular colours, textures, patterned symmetries, and specific floral odours which influence our moods. Indeed, previous research has established that popular perfumes, which often have a floral 'top-note', will actually reduce depression. The origins of these inclinations may well be as the evolutionary theories suggest: the patterned symmetries of flowers can be detected easily as a recognisable signal within a wide variety of visual arrays, and a response to certain colour tones is important in finding ripe fruit against a leafy background. But, claim the Rutgers team, these preferences have long been separated from their primary evolutionary use, and become rewarding to us more generally. Thus, plants with preferred colours, shapes and odours—despite having no other products—would therefore be protected and dispersed.
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The Rutgers study suggests that flowers may have actually evolved to exploit their peculiar impact on humans. The team's theory proposes a plant-human co-evolution, or even domestication, based on the intense emotional rewards that flowers provide. The idea that flowering plants, with no known food or other basic survival value to man, have co-evolved with us by exploiting an emotional niche instead, is very much like the scenario presented for the evolution of dogs. Flowers may be the plant equivalent of 'companion animals'. If this is true, then there is a very real sense in which, when you next give flowers, they are using you just as much as you are using them.