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- For most of human history, the world\u2019s population grew so slowly that for
- most people alive, it would have felt static. Between the year 1 and 1700,
- the human population went from about 200 million to about 600 million; by
- 1800, it had barely hit one billion. Then, the population exploded, first in
- the United Kingdom and the United States, next in much of the rest of Europe,
- and eventually in Asia. By the late 1920s, it had hit two billion. It reached
- three billion around 1960 and then four billion around 1975. It has nearly
- doubled since then. There are now some 7.6 billion people living on the
- planet.
- Just as much of the world has come to see rapid population growth as normal
- and expected, the trends are shifting again, this time into reverse. Most
- parts of the world are witnessing sharp and sudden contractions in either
- birthrates or absolute population. The only thing preventing the population
- in many countries from shrinking more quickly is that death rates are also
- falling, because people everywhere are living longer. These oscillations are
- not easy for any society to manage. \u201cRapid population acceleration and
- deceleration send shockwaves around the world wherever they occur and have
- shaped history in ways that are rarely appreciated,\u201d the demographer Paul
- Morland writes in The Human Tide, his new history of demographics. Morland
- does not quite believe that demography is destiny, as the old adage
- mistakenly attributed to the French philosopher Auguste Comte would have it.
- Nor do Darrell Bricker and John Ibbitson, the authors of Empty Planet, a new
- book on the rapidly shifting demographics of the twenty-first century. But
- demographics are clearly part of destiny. If their role first in the rise of
- the West and now in the rise of the rest has been underappreciated, the
- potential consequences of plateauing and then shrinking populations in the
- decades ahead are almost wholly ignored.\u00a0\n\nThe mismatch between expectations of a rapidly growing global population (and \nall the attendant effects on climate, capitalism, and geopolitics) and the
- reality of both slowing growth rates and absolute contraction is so great
- that it will pose a considerable threat in the decades ahead. Governments
- worldwide have evolved to meet the challenge of managing more people, not
- fewer and not older. Capitalism as a system is particularly vulnerable to a
- world of less population expansion; a significant portion of the economic
- growth that has driven capitalism over the past several centuries may have
- been simply a derivative of more people and younger people consuming more
- stuff. If the world ahead has fewer people, will there be any real economic
- growth? We are not only unprepared to answer that question; we are not even
- starting to ask it.
- At the heart of The Human Tide and Empty Planet, as well as demography in
- general, is the odd yet compelling work of the eighteenth-century British
- scholar Thomas Malthus. Malthus\u2019 1798 Essay on the Principle of Population
- argued that growing numbers of people were a looming threat to social and
- political stability. He was convinced that humans were destined to produce
- more people than the world could feed, dooming most of society to suffer from
- food scarcity while the very rich made sure their needs were met. In
- Malthus dire view, that would lead to starvation, privation, and war,
- which would eventually lead to population contraction, and then the
- depressing cycle would begin again.
- Yet just as Malthus reached his conclusions, the world changed. Increased
- crop yields, improvements in sanitation, and accelerated urbanization led not
- to an endless cycle of impoverishment and contraction but to an explosion of
- global population in the nineteenth century. Morland provides a rigorous and
- detailed account of how, in the nineteenth century, global population reached
- its breakout from millennia of prior human history, during which the
- population had been stagnant, contracting, or inching forward. He starts with
- the observation that the population begins to grow rapidly when infant
- mortality declines. Eventually, fertility falls in response to lower infant
- mortality but there is a considerable lag, which explains why societies in
- the modern world can experience such sharp and extreme surges in population.
- In other words, while infant mortality is high, women tend to give birth to
- many children, expecting at least some of them to die before reaching
- maturity. When infant mortality begins to drop, it takes several generations
- before fertility does, too. So a woman who gives birth to six children
- suddenly has six children who survive to adulthood instead of, say, three.
- Her daughters might also have six children each before the next generation of
- women adjusts, deciding to have smaller families.
- The burgeoning of global population in the past two centuries followed almost
- precisely the patterns of industrialization, modernization, and, crucially,
- urbanization. It started in the United Kingdom at the end of the nineteenth
- century (hence the concerns of Malthus), before spreading to the United
- States and then France and Germany. The trend next hit Japan, India, and
- China and made its way to Latin America. It finally arrived in sub-Saharan
- Africa, which has seen its population surge thanks to improvements in
- medicine and sanitation but has not yet enjoyed the full fruits of
- industrialization and a rapidly growing middle class.
- With the population explosion came a new wave of Malthusian fears, epitomized
- by the 1968 book The Population Bomb, by Paul Ehrlich, a biologist at
- Stanford University. Ehrlich argued that plummeting death rates had created
- an untenable situation of too many people who could not be fed or housed.
- The battle to feed all of humanity is over, he wrote. In the
- 1970the world will undergo famines hundreds of millions of people are
- going to starve to death in spite of any crash programs embarked on now.
- Ehrlich 2019s prophecy, of course, proved wrong, for reasons that Bricker and
- Ibbitson elegantly chart in Empty Planet. The green revolution, a series of
- innovations in agriculture that began in the early twentieth century,
- accelerated such that crop yields expanded to meet humankind 2019s needs.
- Moreover, governments around the world managed to remediate the worst effects
- of pollution and environmental degradation, at least in terms of daily living
- standards in multiple megacities, such as Beijing, Cairo, Mexico City, and
- New Delhi. These cities face acute challenges related to depleted water
- tables and industrial pollution, but there has been no crisis akin to what
- was anticipated.\u00a0\n\nYet visions of dystopic population bombs remain deeply entrenched, including
- at the center of global population calculations: in the forecasts routinely
- issued by the United Nations. Today, the UN predicts that global population
- will reach nearly ten billion by 2050. Judging from the evidence presented in
- Morland\u2019s and Bricker and Ibbitson\u2019s books, it seems likely that this
- estimate is too high, perhaps substantially. It\u2019s not that anyone is
- purposely inflating the numbers. Governmental and international statistical
- agencies do not turn on a dime; they use formulas and assumptions that took
- years to formalize and will take years to alter. Until very recently, the
- population assumptions built into most models accurately reflected what was
- happening. But the sudden ebb of both birthrates and absolute population
- growth has happened too quickly for the models to adjust in real time. As
- Bricker and Ibbitson explain, \u201cThe UN is employing a faulty model based on
- assumptions that worked in the past but that may not apply in the future.\
- Population expectations aren't merely of academic interest; they are a key
- element in how most societies and analysts think about the future of war and
- conflict. More acutely, they drive fears about climate change and
- environmental stability\u2014especially as an emerging middle class numbering in
- the billions demands electricity, food, and all the other accoutrements of
- modern life and therefore produces more emissions and places greater strain
- on farms with nutrient-depleted soil and evaporating aquifers. Combined with
- warming-induced droughts, storms, and shifting weather patterns, these trends
- would appear to line up for some truly bad times ahead.\n\nExcept, argue Bricker and Ibbitson, those numbers and all the doomsday \nscenarios associated with them are likely wrong. As they write,
- We do not face the challenge of a population bomb but a population bust a relentless,
- generation-after-generation culling of the human herd.\u201d Already, the signs
- of the coming bust are clear, at least according to the data that Bricker and
- Ibbitson marshal. Almost every country in Europe now has a fertility rate
- below the 2.1 births per woman that is needed to maintain a static
- population. The UN notes that in some European countries, the birthrate has
- increased in the past decade. But that has merely pushed the overall European
- birthrate up from 1.5 to 1.6, which means that the population of Europe will
- still grow older in the coming decades and contract as new births fail to
- compensate for deaths. That trend is well under way in Japan, whose
- population has already crested, and in Russia, where the same trends, plus
- high mortality rates for men, have led to a decline in the population.
- What is striking is that the population bust is going global almost as
- quickly as the population boom did in the twentieth century. Fertility rates
- in China and India, which together account for nearly 40 percent of the
- world\u2019s people, are now at or below replacement levels. So, too, are
- fertility rates in other populous countries, such as Brazil, Malaysia,
- Mexico, and Thailand. Sub-Saharan Africa remains an outlier in terms of
- demographics, as do some countries in the Middle East and South Asia, such as
- Pakistan, but in those places, as well, it is only a matter of time before
- they catch up, given that more women are becoming educated, more children are
- surviving their early years, and more people are moving to cities.
- Morland, who, unlike Bricker and Ibbitson, is a demographer by training, is
- skeptical that humanity is on the cusp of a tectonic reversal in population
- trends. He agrees that the trends have changed, but he is less prone to the
- blanket certainty of Bricker and Ibbitson. This is not because he uses
- different data; he simply recognizes that population expectations have
- frequently been confounded in the past and that certainty about future trends
- is unreasonable. Morland rightly points out that even if fertility rates fall
- dramatically in Africa, there will be decades left of today\u2019s youth bulge
- there. Because he is more measured in his assessment of the ambiguities and
- uncertainties in the data, Morland tends to be more circumspect in drawing
- dramatic conclusions. He suggests, for instance, that China\u2019s population
- will peak short of 1.5 billion in 2030 and then stagnate, with an aging
- population and gradual absolute decline thereafter. Bricker and Ibbitson, on
- the other hand, warn that China\u2019s fertility rate, already in free fall,
- could actually get much worse based on the example of Japan, which would lead
- China to shrink to less than 700 million people in the second half of the
- century. Morland does agree with Bricker and Ibbitson on one important point:
- when it comes to global population, the only paradigm that anyone has known
- for two centuries is about to change.
- GREAT EXPECTATIONS
- The implications of the coming population bust occupy a large portion of
- Bricker and Ibbitson\u2019s book, and they should occupy a much larger portion
- of the collective debate about the future and how to prepare for it. The
- underlying drivers of capitalism, the sense that resource competition and
- scarcity determine the nature of international relations and domestic
- tensions, and the fear that climate change and environmental degradation are
- almost at a doomsday point\u2014all have been shaped by the persistently
- ballooning population of the past two centuries. If the human population is
- about to decline as quickly as it increased, then all those systems and
- assumptions are in jeopardy.\n\nBoth books note that the demographic collapse could be a bright spot for
- climate change. Given that carbon emissions are a direct result of more
- people needing and demanding more stuff\u2014from food and water to cars and
- entertainment\u2014then it would follow that fewer people would need and demand
- less. What\u2019s more, larger proportions of the planet will be aging, and the
- experiences of Japan and the United States are showing that people consume
- less as they age. A smaller, older population spells some relief from the
- immense environmental strain of so many people living on one finite globe.
- That is the plus side of the demographic deflation. Whether the concomitant
- greening of the world will happen quickly enough to offset the worst-case
- climate scenarios is an open question\u2014although current trends suggest that
- if humanity can get through the next 20 to 30 years without irreversibly
- damaging the ecosystem, the second half of the twenty-first century might be
- considerably brighter than most now assume. The downside is that a sudden
- population contraction will place substantial strain on the global economic
- system. Capitalism is, essentially, a system that maximizes more\u2014more
- output, more goods, and more services. That makes sense, given that it
- evolved coincidentally with a population surge. The success of capitalism in
- providing more to more people is undeniable, as are its evident defects in
- providing every individual with enough. If global population stops expanding
- and then contracts, capitalism\u2014a system implicitly predicated on
- ever-burgeoning numbers of people\u2014will likely not be able to thrive in its
- current form. An aging population will consume more of certain goods, such as
- health care, but on the whole aging and then decreasing populations will
- consume less. So much of consumption occurs early in life, as people have
- children and buy homes, cars, and white goods. That is true not just in the
- more affluent parts of the world but also in any country that is seeing a
- middle-class surge.
- But what happens when these trends halt or reverse? Think about the future
- cost of capital and assumptions of inflation. No capitalist economic system
- operates on the presumption that there will be zero or negative growth. No
- one deploys investment capital or loans expecting less tomorrow than today.
- But in a world of graying and shrinking populations, that is the most likely
- scenario, as Japan\u2019s aging, graying, and shrinking absolute population now
- demonstrates. A world of zero to negative population growth is likely to be a
- world of zero to negative economic growth, because fewer and older people
- consume less. There is nothing inherently problematic about that, except for
- the fact that it will completely upend existing financial and economic
- systems. The future world may be one of enough food and abundant material
- goods relative to the population; it may also be one in which capitalism at
- best frays and at worst breaks down completely.
- The global financial system is already exceedingly fragile, as evidenced by
- the 2008 financial crisis. A world with negative economic growth, industrial
- capacity in excess of what is needed, and trillions of dollars expecting
- returns when none is forthcoming could spell a series of financial crises. It
- could even spell the death of capitalism as we know it. As growth grinds to a
- halt, people may well start demanding a new and different economic system.
- Add in the effects of automation and artificial intelligence, which are
- already making millions of jobs redundant, and the result is likely a future
- in which capitalism is increasingly pass.
- If population contraction were acknowledged as the most likely future, one
- could imagine policies that might preserve and even invigorate the basic
- contours of capitalism by setting much lower expectations of future returns
- and focusing society on reducing costs (which technology is already doing)
- rather than maximizing output. But those policies would likely be met in the
- short term by furious opposition from business interests, policymakers, and
- governments, all of whom would claim that such attitudes are defeatist and
- could spell an end not just to growth but to prosperity and high standards of
- living, too. In the absence of such policies, the danger of the coming shift
- will be compounded by a complete failure to plan for it.
- Different countries will reach the breaking point at different times. Right
- now, the demographic deflation is happening in rich societies that are able
- to bear the costs of slower or negative growth using the accumulated store of
- wealth that has been built up over generations. Some societies, such as the
- United States and Canada, are able to temporarily offset declining population
- with immigration, although soon, there won't be enough immigrants left. As
- for the billions of people in the developing world, the hope is that they
- become rich before they become old. The alternative is not likely to be
- pretty: without sufficient per capita affluence, it will be extremely
- difficult for developing countries to support aging populations.
- So the demographic future could end up being a glass half full, by
- ameliorating the worst effects of climate change and resource depletion, or a
- glass half empty, by ending capitalism as we know it. Either way, the
- reversal of population trends is a paradigm shift of the first order and one
- that is almost completely unrecognized. We are vaguely prepared for a world
- of more people; we are utterly unprepared for a world of fewer. That is our
- future, and we are heading there fast.
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