Human Population Chapters 8 and 9

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1 Human Population Chapters 8 and 9 I. The principles of population ecology apply to humans. A. The world population was 6.07 billion in 2000 and increased by 85 million from 1999 to Although our numbers continue to increase, the growth rate (r) has declined slightly over the past several years, from a peak in the mid-1960s of 2.2% per year to 1.4% per year in Demographers, scientists who study population statistics, project that the world population will become stationary (r = 0), that is, zero population growth, by the end of the 21st century. B. Highly developed countries have the lowest birth rates, lowest infant mortality rates, longest life expectancies, and highest per-capita GNPs. Developing countries have the highest birth rates, highest infant mortality rates, shortest life expectancies, and lowest per-capita GNPS. In recent decades, it has become useful to recognize a distinction within the developing countries between: 1. Moderately developed countries (e.g., Argentina, Brazil, Chile, Mexico, Thailand, Turkey, and Venezuela.) 2. Less developed countries or LDCs (e.g., Bangladesh, Cambodia, Laos, Ethiopia, and Niger.) C. The Demographic Transition refers to a commonly observed sequence of populationrelated events through which populations or nations almost invariably pass during the course of industrialization: 1. In the preindustrial stage, birth rates and death rates have been in equilibrium for many generations during which the level of the technology used by a society remained essentially unchanged. Infant mortality rates are characteristically high during this stage, and disease is often an important regulator of population as well. 2. In the transitional stage, technologies which can offer the largest reduction in human misery in return for the smallest investment of capital are introduced. These early transitional technologies include public health measures ensuring access to clean water and reduced human contact with sewage. The great European plagues were ended not by the developing of modern medicine but by improvements in public health measures. Vaccinations also offer a lot of bang for the buck and are among the earliest misery-reducing technologies to be introduced. Birth rates do not begin to decline until late in the transitional stage, so the imbalance between r and d generates a period of tremendous population growth. 3. In the industrial stage, the population finally begins to enjoy the benefits of affluence. For example, most costly measures to reduce human suffering become affordable, such as high-tech medicine. Certainly, most individuals in such societies can afford the modest costs of measures to reduce infant and maternal mortality. Another benefit of affluence is an almost guaranteed reduction in birth rates.

2 a. Affluence is the best contraceptive. Moderately developed countries typically have lower fertility rates than LDCs (Table 8-3). Appreciable population growth may still occur during this stage, especially as a result of population growth momentum (see below) remaining from transitional times. b. Once a society reaches the industrial stage, restricting family size leads to an increase in standard of living and ability to educate the next generation. This situation is a reverse of the case in preindustrial societies where offspring go to work at an early age to contribute to the support of their families. c. Points 3a and 3b above form a kind of positive feedback loop that virtually ensures that industrialization leads to an eventual decrease in total fertility rate (number of offspring per woman in her lifetime). 4. Postindustrial societies have either equilibrated at their maximum population density or have entered a period of population decline following a peak at the end of the industrial period. Even in postindustrial societies, the inverse relationship between wealth and fertility can result in changes in the relative population sizes of different groups within a society if discrimination, recent immigration, or other factor produces a less wealthy subpopulation. 5. Most future growth of the world s population is predicted to occur in countries that are in the earliest portions of the transition stage, i.e., in less-developed countries. (Fig. 8-16) 6. In modern times, the contraceptive effect of affluence is, of course, actually produced through the use of contraceptive technologies (Table 8-3 and Fig. 9-9) D. The age structure of a population greatly influences population dynamics. Age structure diagrams illustrate the distribution of a population into different age and gender classes (Fig. 8-14), using a pyramid-like double histogram with number of males per age class on the left and females on the right. 1. It is possible for a country to have replacement-level fertility and still experience population growth if the largest percentage of the population is in the pre-reproductive years. a. Replacement-level fertility is the number of children a couple must have to contribute an average of two reproductive-age adults to the next generation. b. Replacement-level fertility is not a built-in property of the human species but, instead, varies markedly as a function of the exact shape of the survivorship curve applicable to a particular homogenous country or subpopulation in a heterogeneous country. c. Replacement-level fertility in highly equitable, postindustrial countries is about 2.1 children per couple, and in developing countries it is about 2.7 children. The last figure your instructor saw for the U.S. was 2.3 children per couple.

3 2. Such an age structure causes a positive population growth momentum. If you ignore the male side of a country s age-structure diagram and reverse the X- and Y-axes, the resulting histogram should have exactly the same shape as the survivorship curve (on arithmetic axes!) for that country, IF the population is to have no population growth momentum. If the age-structure is too rich at the young end of the histogram (e.g., Fig. 8-13, left side and Fig 8-14a, Nigeria), then built in population growth is assured when the children of the present reach their reproductive ages, even if they all reproduce at exactly replacement levels. If the age structure is too lean at the young end (e.g., Fig right third, and Fig. 8-14c, Germany), then the population will shrink even if all the new couples reproduce at replacement levels. The percentage of a country s population below reproductive age gives a good indicator of how much built in momentum its age structure is likely to have (cf. Fig. 8-15). E. The United States has one of the highest rates of population increase (0.6% in 2000) of all the highly developed countries. 1. The U.S. population has a positive population growth momentum because of the Baby Boom (the large wave of births that occurred after World War II) and immigration. 2. Compared to countries like Sweden where college professors earn the equivalent of $1000 to $1500 more per year than garbage collectors, income and wealth in the U.S. are distributed in a much less uniform fashion. Areas and populations can be found within the U.S. that resemble those in the developing world, so we should not be surprised that those areas and populations have population growth rates that are more like those of developing countries than more homogeneous highly developed countries. 3. The Immigration Reform and Control Act (IRCA), the basic immigration law in effect in the United States, gives three groups of people priority when migrating to the United States: those with family members living in the United States, those who can fill vacant jobs, and refugees seeking asylum. II. Many human problems, such as hunger, resource depletion, environmental problems, underdevelopment, poverty, and urban problems, are exacerbated by the rapid increase in population. A. The countries with the greatest food shortages also have some of the highest total fertility rates. Much of South and Southeast Asia (except the Asian Tigers, like Thailand) fall into this category, as well as most of sub-saharan Africa. B. Economic development, poverty, and the inequitable distribution of resources influence the relationship between world hunger and population growth. Hopes that rising affluence will rapidly reduce fertility in developing countries are often frustrated by the highly inequitable distribution of income in most of those nations. Recent calls to forgive the debts owed by the poorest of the less-developed countries are motivated in part by the virtual certainty that these countries will be trapped in poverty and locked into a highfertility stage of the demographic transition if the debts are not erased. C. Underdevelopment and poverty are associated with high total fertility rates. Most

4 economists think that slowing population growth helps promote economic development, and vice versa. III. In developing countries, individual resource demands are small, but rapidly increasing populations deplete natural resources. In highly developed countries, individual resource demands are large and deplete natural resources. A. Nonrenewable resources are present in a limited supply and cannot be replenished in a reasonable period. Slowing the rate of population growth will give more time to find substitutes for nonrenewable resources as they are depleted, and to develop technologies for the more efficient use and reuse of these resources. B. Renewable resources are replaced by natural processes and can be used forever, provided they are used in a sustainable way. Overpopulation causes renewable resources to be overexploited. When this happens, renewable resources become nonrenewable. We have already discussed fisheries as examples of over-exploitation resulting in the near loss of potentially renewable resources (e.g., the collapse of the Georges Bank, Fig. 1-5) C. There are two kinds of overpopulation: people overpopulation and consumption overpopulation. 1. People overpopulation occurs when the environment is worsening from too many people, even if they consume few resources per person. Developing countries have people overpopulation. 2. Consumption overpopulation occurs when each individual consumes too large a share of resources, thereby degrading the environment. Highly developed countries have consumption overpopulation. D. One model of environmental impact (I) has three factors: The number of people (P), the affluence per person (A), which is a measure of the amount of resources used per person, and the environmental effect of the technologies used to obtain and consume those resources (T). The model: I = P A T 1. This model shows the mathematical relationship between environmental impacts and the forces that drive them. 2. The text provides the following example to build intuition: a. P = number of U.S. drivers b. A = ave. number of miles driven annually by each driver c. T = ave. g of CO 2 emitted per mile driven. (Note: Your instructors s calculations say to calculate T, divide 7970 by gas mileage in miles per gallon. ) d. I = annual CO 2 produced by U.S. cars.

5 IV. As a nation develops economically, the proportion of the population living in cities increases. As a nation develops economically, the percentage of all city-dwellers who are female also increases, particularly in Africa where agriculture is mostly a female enterprise. A. The process by which people increasingly move from rural areas to densely populated cities is known as urbanization. B. In developing nations, most people live in rural settings, but their rates of urbanization are rapidly increasing. Most urban growth now occurs in developing nations (Table 9-1). This makes it difficult to provide city dwellers with basic services such as housing, water, sewage, and transportation systems. C. A solution to urban growth is compact development, in which cities are designed so that multiple-unit residential buildings are close to shopping and jobs, all of which are connected to public transportation. 1. Portland, Oregon, is a good example of compact development in a highly developed country. Between 1975 and 2000, Portland s population increased by about 50%, but its urbanized area increased by just 2%. They have strict land use policies around Portland designed to restrict suburban sprawl and encourage reuse of brownfields. 2. Curitiba (pop. 2,500,000), Brazil, is a good example of compact development in a moderately developed country. Land use policies restricted high-density development to corridors along major bus lines, so 75% of commuters use the buses. Curitiba s population has doubled since 1974, but traffic has declined by 30%. D. Urbanization appears to be a factor in decreasing population growth. An often-cited explanation for this observation is that distribution of contraceptives is much easier in urban than in rural settings. V. The relationships between total fertility rate and cultural, social, governmental, and economic factors are many and varied. A. A combination of four factors is thought to be primarily responsible for high total fertility rates: 1. High infant and child mortality rates create in the minds of many parents the need to have many children if a few are to survive to maturity. 2. The important economic and societal roles of children in some cultures. Do the kids work in the fields or for monetary wages, or do they cost money to put through college? In many developing countries where pension plans are not widely available, parents are completely reliant upon their children for support and care in their old age. 3. The low status of women in many societies. Increasing the educational opportunities for women in many countries has coincided with decreases in fertility rates. Better educated women often delay childbearing until they have accumulated some wealth from the monetary wages to which education gives them access. The contraceptive effects of affluence then seem exert themselves.

6 4. A lack of health and family planning services, which are particularly difficult to distribute to the mostly rural populations typical of countries in the early transitional stage of the demographic transition. B. The single most important factor contributing to high total fertility rates is the low status of women in many societies, esp. as that status affects their educational opportunities. VI. The governments of many developing countries are trying to limit population growth. A. In 1979 China began a coercive, one-child family policy to reduce total fertility rate. The program, which has been successful but unpopular, was relaxed in rural China in Education and publicity campaigns are also used today. B. India's government has sponsored family planning since the 1950s. In 1976 India introduced compulsory sterilization in several states, but this coercive policy failed. Education and publicity campaigns are the focus of its family planning efforts today. C. Mexico s government has sponsored family planning since Mexico's total fertility rate continues to drop, largely in response to education, improved health care, economic development, and publicity campaigns. D. Nigeria put a national population policy into place in 1986 that includes education, improved health care, and economic development. These efforts have been largely ineffective, and Nigeria's total fertility rate remains as high as it was in the early 1980s. VII. The 1994 U.N. International Conference on Population and Development drafted a 20-year World Program of Action that focuses on reproductive rights, empowerment of women, and reproductive health. The program is currently underfunded, largely because funds from the U.S., which was to have been the single largest donor country, have been withheld by legislators in Congress who were concerned that some U.S. taxpayer dollars would pay for abortions in developing countries. Ironically, the U. N. Population Fund estimates that underfunding the World Program of Action will lead to 122 to 220 million unintended pregnancies of which 43 to 88 million will end in abortion.

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