Chapter 15 Population and the Environment

Fertility and Birth Rates

FertilityThe number of live births. refers to the number of live births. Demographers use several measures of fertility. One measure is the crude birth rateThe number of live births for every 1,000 people in a population in a given year., or the number of live births for every 1,000 people in a population in a given year. We call this a “crude” birth rate because the population component consists of the total population, not just the number of women or even the number of women of childbearing age (commonly considered 15–44 years).

A second measure is the general fertility rateThe number of live births per 1,000 women aged 15–44 years. (also just called the fertility rate or birth rate), or the number of live births per 1,000 women aged 15–44 (i.e., of childbearing age). The US general fertility rate for 2010 was about 64.7 (i.e., 64.7 births per 1,000 women aged 15–44) (Sutton & Hamilton, 2011).Sutton, P. D., & Hamilton, B. E. (2011). Recent trends in births and fertility rates through 2010. Washington, DC: Centers for Disease Control and Prevention.

A third measure is the total fertility rateThe number of children an average woman is expected to have in her lifetime, sometimes expressed as the number of children an average 1,000 women are expected to have in their lifetimes., or the number of children an average woman is expected to have in her lifetime (taking into account that some women have more children and some women have fewer or no children). This measure often appears in the news media and is more easily understood by the public than either of the first two measures. In 2010, the US total fertility rate was about 1.93 (or 1,930 births for every 1,000 women) (Hamilton, Martin, & Ventura, 2011).Hamilton, B. E., Martin, J. A., & Ventura, S. J. (2011). Births: Preliminary data for 2010. National Vital Statistics Reports, 60(2), 1–14.

Demographers use several measures of fertility. The general fertility rate refers to the number of live births per 1,000 women aged 15–44. The US general fertility rate is about 65.5.

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As Figure 15.1 "US General Fertility Rate, 1920–2010" indicates, the US general fertility rate has changed a lot since 1920, dropping from 101 (per 1,000 women aged 15–44) in 1920 to 70 in 1935, during the Great Depression, before rising afterward until 1955. (Note the very sharp increase from 1945 to 1955, as the post–World War II baby boom began.) The fertility rate then fell steadily after 1960 until the 1970s but has remained rather steady since then, fluctuating only slightly between 65 and 70 per 1,000 women aged 15–44.

Figure 15.1 US General Fertility Rate, 1920–2010

Sources: Data from Hamilton, B. E., Martin, J. A., & Ventura, S. J. (2011). Births: Preliminary data for 2010. National Vital Statistics Reports, 60(2), 1–13; Martin, J. A., Hamilton, B. E., Sutton, P. D., Ventura, S. J., Menacker, F., Kirmeyer, S., & Mathews, T. J. (2009). Births: Final data for 2006. National Vital Statistics Reports, 57(7), 1–102; US Census Bureau. (1951). Statistical abstract of the United States: 1951. Washington, DC: US Government Printing Office.

Fertility rates differ around the world and are especially high in poor nations (see Figure 15.2 "Crude Birth Rates around the World, 2008 (Number of Births per 1,000 Population)"). Demographers identify several reasons for these high rates (Weeks, 2012).Weeks, J. R. (2012). Population: An introduction to concepts and issues (11th ed.). Belmont, CA: Wadsworth.

Figure 15.2 Crude Birth Rates around the World, 2008 (Number of Births per 1,000 Population)

Source: Adapted from http://en.wikipedia.org/wiki/File:Birth_rate_figures_for_countries.PNG.

First, poor nations are usually agricultural ones. In agricultural societies, children are an important economic resource, as a family will be more productive if it has more children. This means that families will ordinarily try to have as many children as possible. Second, infant and child mortality rates are high in these nations. Because parents realize that one or more of their children may die before adulthood, they have more children to make up for the anticipated deaths.

A third reason is that many parents in low-income nations prefer sons to daughters, and, if a daughter is born, they try again for a son. Fourth, traditional gender roles are often very strong in poor nations, and these roles include the belief that women should be wives and mothers above all. With this ideology in place, it is not surprising that women will have several children. Finally, contraception is uncommon in poor nations. Without contraception, many more pregnancies and births certainly occur. For all these reasons, then, fertility is much higher in poor nations than in rich nations.

Poor nations have higher birth rates for several reasons. One reason is the agricultural economies typical of these nations. In these economies, children are an important economic resource, and families will ordinarily try to have as many children as possible.

Image courtesy of R. Kalden, Voice of America, http://commons.wikimedia.org/wiki/File:Children_near_renovation_of_Jawaharlal_Nehru_Stadium_in_New_Delhi_2010-02-24.JPG .

Mortality and Death Rates

MortalityThe number of deaths. is the flip side of fertility and refers to the number of deaths. Demographers measure it with the crude death rateThe number of deaths for every 1,000 people in a population in a given year., the number of deaths for every 1,000 people in a population in a given year. We call this a “crude” death rate because the population component consists of the total population and does not take its age distribution into account. All things equal, a society with a higher proportion of older people should have a higher crude death rate. Demographers often calculate age-adjusted death rates that adjust for a population’s age distribution.

Migration

Another important demographic concept is migrationThe movement of people into or out of specific regions., the movement of people into and out of specific regions. Since the dawn of human history, people have migrated in search of a better life, and many have been forced to migrate by ethnic conflict or the slave trade.

Several classifications of migration exist. When people move into a region, we call it in-migration, or immigration; when they move out of a region, we call it out-migration, or emigration. The in-migration rate is the number of people moving into a region for every 1,000 people in the region, while the out-migration rate is the number of people moving from the region for every 1,000 people. The difference between the two is the net migration rate (in-migration minus out-migration). Recalling our earlier discussion. Michigan has had a net migration of less than zero, as its out-migration has exceeded its in-migration.

Migration can also be either domestic or international in scope. Domestic migration happens within a country’s national borders, as when retired people from the northeastern United States move to Florida or the Southwest. International migration happens across national borders. When international immigration is heavy, the effect on population growth and other aspects of national life can be significant, as can increased prejudice against the new immigrants. Domestic migration can also have a large impact. The great migration of African Americans from the South into northern cities during the first half of the twentieth century changed many aspects of those cities’ lives (Wilkerson, 2011).Wilkerson, I. (2011). The warmth of other suns: The epic story of America’s great migration New York, NY: Vintage Books. Meanwhile, the movement during the past few decades of northerners into the South and Southwest also had quite an impact: The housing market initially exploded, for example, and traffic increased.

The Debate over Overpopulation

Many experts continue to be concerned about overpopulation, as they feel it is directly responsible for the hunger and malnutrition that plague hundreds of millions of people in poor nations (Gillis, 2011).Gillis, J. (2011, June 5). A warm planet struggles to feed itself. New York Times, p. A1. One expert expressed this concern: “Every billion more people makes life more difficult for everybody—it’s as simple as that. Is it the end of the world? No. Can we feed 10 billion people? Probably. But we obviously would be better off with a smaller population” (Gillis & Dugger, 2011, p. A1).Gillis, J., & Dugger, C. W. (2011, May 4). UN forecasts 10.1 million by century’s end. New York Times, p. A1. Recognizing this problem, India has begun giving cash bonuses to poor, rural married couples, who typically have high fertility rates, to wait to have children, and it has intensified its encouragement of contraception (Yardley, 2010).Yardley, J. (2010, August 22). India tries using cash bonuses to slow birthrates. New York Times, p. A8.

Calls during the 1970s for zero population growth (ZPG) population control stemmed from concern that the planet was becoming overpopulated and that food and other resources would soon be too meager to support the world’s population.

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However, other experts say the world’s resources remain sufficient and minimize the problem of overpopulation. They acknowledge that widespread hunger in Africa and other regions does exist. However, they attribute this problem not to overpopulation and lack of food but rather to problems in distributing the sufficient amount of food that does in fact exist. As an official for Oxfam International explained, “Today’s major problems in the food system are not fundamentally about supply keeping up with demand, but more about how food gets from fields and on to forks” (2011).King, R. (2011, June 1). Global food crisis: The challenge of changing diets. The Guardian. Retrieved from http://www.guardian.co.uk/global-development/poverty-matters/2011/jun/01/global-food-crisis-changing-diets. The official added that enough grain (cereal and soy) exists to easily feed the world, but that one-third of cereal and 90 percent of soy feed livestock instead. Moving away from a meat-laden Western diet would thus make much more grain available for the world’s hungry poor.

Sociologists Stephen J. Scanlan and colleagues add that food scarcity results from inequalities in food distribution rather than from overpopulation: “[Food] scarcity is largely a myth. On a per capita basis, food is more plentiful today than any other time in human history…Even in times of localized production shortfalls or regional famines there has long been a global food surplus…A good deal of thinking and research in sociology…suggests that world hunger has less to do with the shortage of food than with a shortage of affordable or accessible food. Sociologists have found that social inequalities, distribution systems, and other economic and political factors create barriers to food access” (Scanlan, Jenkins, & Peterson, 2010, p. 35).Scanlan, S. J., Jenkins, J. C., & Peterson, L. (2010). The scarcity fallacy. Contexts, 9(1), 34–39.

This sociological view has important implications for how the world should try to reduce global hunger. International organizations such as the World Bank and several United Nations agencies have long believed that hunger is due to food scarcity, and this belief underlies the typical approaches to reducing world hunger that focus on increasing food supplies with new technologies and developing more efficient methods of delivering food. But if food scarcity is not a problem, then other approaches are necessary. According to Scanlan et al., these approaches involve reducing the social inequalities that limit poor nations’ access to food.

As an example of one such inequality, Scanlan et al. point out that poor nations lack the funds to import the abundant food that does exist. These nations’ poverty, then, is one inequality that leads to world hunger, but gender and ethnic inequalities are also responsible. Nations with higher rates of gender inequality and ethnic inequality have higher rates of hunger. In view of this fact, the authors emphasize that improvements in gender and ethnic equality are necessary to reduce global hunger: “International attention to food security should therefore shift from increasing food supply to regulating armed conflict, improving human rights, and promoting gender equity throughout the world—factors that reduce barriers to access and empower populations throughout the world to benefit from their food entitlements” (Scanlan et al., 2010, p. 39).Scanlan, S. J., Jenkins, J. C., & Peterson, L. (2010). The scarcity fallacy. Contexts, 9(1), 34–39.

Demographic Transition Theory

As we consider whether overpopulation is the threat that Malthus and contemporary concerned scientists have considered it to be, it is important to appreciate demographic transition theoryA theory that links population growth to the level of technological development across three stages of social evolution., mentioned earlier. This theory links population growth to the level of technological development across three stages of social evolution and suggests that this growth slows considerably as nations become more industrialized.

In the first stage, coinciding with preindustrial societies, the birth rate and death rate are both high. The birth rate is high because of the lack of contraception and the several other reasons cited earlier for high fertility rates, and the death rate is high because of disease, poor nutrition, lack of modern medicine, and other problems. These two high rates cancel each other out, and little population growth occurs.

In the second stage, coinciding with the development of industrial societies, the birth rate remains fairly high, owing to the lack of contraception and a continuing belief in the value of large families, but the death rate drops because of several factors, including increased food production, better sanitation, and improved medicine. Because the birth rate remains high but the death rate drops, population growth takes off dramatically.

In the third stage, the death rate remains low, but the birth rate finally drops as families begin to realize that large numbers of children in an industrial economy are more of a burden than an asset. Another reason for the drop is the availability of effective contraception. As a result, population growth slows, and, as we saw earlier, it has become quite low or even gone into a decline in several industrial nations.

Demographic transition theory, then, gives us more reason to be cautiously optimistic regarding the threat of overpopulation: As poor nations continue to modernize—much as industrial nations did two hundred years ago—their population growth rates should start to decline.

Still, population growth rates in poor nations continue to be high, and, as already mentioned, gender and ethnic inequality helps allow rampant hunger to persist. Hundreds of thousands of women die in poor nations each year during pregnancy and childbirth. Reduced fertility would save their lives, in part because their bodies would be healthier if their pregnancies were spaced farther apart (Schultz, 2008).Schultz, T. P. (2008). Population policies, fertility, women’s human capital, and child quality. In T. P. Schultz & J. Strauss (Eds.), Handbook of development economics (Vol. 4, pp. 3249–3303). Amsterdam, Netherlands: North-Holland, Elsevier. Although world population growth is slowing, then, it is still growing too rapidly in poor nations. To reduce it further, more extensive family planning programs are needed, as is economic development in general: Women who are better educated and have more money tend to have lower fertility.

Population Decline and Pronatalism

Spain is one of several European nations that have been experiencing a population decline because of lower birth rates. Like some other nations, Spain has adopted pronatalist policies to encourage people to have more children; it provides €2,500, about $3,400, for each child.

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If population growth remains a problem in poor nations, population decline is a problem in some industrial nations. As noted earlier, some nations are even experiencing population declines, while several more are projected to have population declines by 2050 (Brooks, 2012).Brooks, D. (2012, March 13). The population implosion. New York Times, p. A25. For a country to maintain its population, the average woman needs to have 2.1 children, the replacement level for population stability. But several industrial nations, not including the United States, are below this level. Increased birth control is one reason for their lower fertility rates but so are decisions by women to stay in school longer, to go to work right after their schooling ends, and to postpone having their first child.

Ironically, these nations’ population declines have begun to concern demographers and policymakers (Haartsen & Venhorst, 2010).Haartsen, T., & Venhorst, V. (2010). Planning for decline: Anticipating on population decline in the Netherlands. Tijdschrift voor Economische en Sociale Geografie (Journal of Economic & Social Geography), 101(2), 218–227. Because people in many industrial nations are living longer while the birth rate drops, these nations are increasingly having a greater proportion of older people and a smaller proportion of younger people. In several European nations, there are more people 61 or older than 19 or younger. As this trend continues, it will become increasingly difficult to take care of the health and income needs of so many older persons, and there may be too few younger people to fill the many jobs and provide the many services that an industrial society demands. The smaller labor force may also mean that governments will have fewer income tax dollars to provide these services.

To deal with these problems, several governments have initiated pronatalistReferring to policies that encourage women to have children. policies aimed at encouraging women to have more children. In particular, they provide generous child-care subsidies, tax incentives, and flexible work schedules designed to make it easier to bear and raise children, and some even provide couples outright cash payments when they have an additional child. Russia in some cases provides the equivalent of about $9,000 for each child beyond the first, while Spain provides €2,500 (equivalent to about $3,400) for each child (Haub, 2009).Haub, C. (2009). Birth rates rising in some low birth-rate countries. Washington, DC: Population Reference Bureau. Retrieved from http://www.prb.org/Articles/2009/fallingbirthrates.aspx.

Immigration Today

Immigration continues to be a major concern for many Americans today, whose concern centers mostly on Mexican immigrants even though they are less than a majority of all immigrants. According to political scientist Victoria M. DeFrancesco Soto (2012),DeFrancesco Soto, V. M. (2012, February 24). Anti-immigrant rhetoric is anti-Latino. The Nation. Retrieved from http://www.thenation.com/blog/166442/anti-immigrant-rhetoric-anti-latino. this focus stems from racial prejudice: “Let’s call a spade a spade. Opposition to immigration is not a concern rooted in personal economic concerns. Neither is it a concern having to do with state’s rights. Anti-immigrant sentiment isn’t even about immigrants as a whole. As rigorous social scientific research shows, opposition to immigration is closely linked to the negative racial animus toward one very specific group, Latinos.”

As we try to make sense of immigration and of immigration policy, some basic facts are worth appreciating. The number of immigrants greatly increased two or three decades ago, but the number of illegal immigrants entering the United States now is very small compared to just a decade ago (Myers, 2012).Myers, D. (2012, January 12). The next immigration challenge. New York Times, p. A27. Foreign-born residents composed 12.9 percent of the US population in 2010, or 40 million immigrants overall, compared to only 7.9 percent in 1990 (Immigration Policy Center, 2012).Immigration Policy Center. (2012). Strength in diversity: The economic and political power of immigrants, Latinos, and Asians. Washington, DC: Author. Almost one-third of immigrants are Mexican, while one-fourth are Asian. Most of the remainder come from the Caribbean, Central America, and South America. Slightly more than half of all foreign-born residents come from Mexico or one of the other Latin American nations. Almost 40 percent of Latinos and two-thirds of Asians in the United States are foreign-born.

Almost three-fourths of immigrants are naturalized US citizens, legal residents, or legal temporary migrants. Slightly more than one-fourth, 28 percent, or about 11 million people, are illegal residents. About 60 percent, or almost 7 million, of these residents are Mexican. Approximately 4.5 million children born in the United States, who are thus citizens, have at least one parent who is an unauthorized immigrant.

Unauthorized immigrants compose more than 5 percent of the US labor force, a number equivalent to 8 million workers. Households headed by unauthorized immigrants paid an estimated $11.2 billion in state and federal taxes in 2010. According to the Immigration Policy Center (2012),Immigration Policy Center. (2012). Strength in diversity: The economic and political power of immigrants, Latinos, and Asians. Washington, DC: Author. if all unauthorized immigrants somehow left the United States, the US economy would suffer an annual loss of 2.8 million jobs, $552 billion in economic activity, and $245 billion in gross domestic product (GDP).

As these labor and economic figures make clear, illegal immigrants form an important component of the US economy. In another fact that may surprise immigration opponents, many studies also find that immigrants, both legal and illegal, have lower crime rates than nonimmigrants (Wadsworth, 2010).Wadsworth, T. (2010). Is immigration responsible for the crime drop? An assessment of the influence of immigration on changes in violent crime between 1990 and 2000. Social Science Quarterly, 91, 531–553. These low rates are thought to stem from immigrants’ stable families, strong churches, and high numbers of small businesses that make for stable neighborhoods. Ironically, as immigrants stay longer in the United States, the crime rates of their children, and then those of their children’s children, become higher. As immigrant families stay longer in the United States, then, their crime rates tend to rise, in part because they become “Americanized” (Sampson, 2008).Sampson, R. J. (2008). Rethinking crime and immigration. Contexts, 7(2), 28–33.

Efforts to Limit Immigration

Although immigrants strengthen the US economy and have low crime rates, much of the public is opposed to immigration. In the 2010 General Social Survey (GSS), half the respondents said that the number of immigrants to the United States should be reduced by “a little” or “a lot,” and only about 14 percent said this number should be increased. In a 2011 CNN poll, one-third of the public said it is “somewhat” or “very” unsympathetic toward illegal immigrants and their families. In the same poll, more than half the public favored building a seven-hundred-mile fence along the border with Mexico (PollingReport.com, 2012).PollingReport.com. (2012). Immigration. Retrieved February 8, 2012, from http://www.pollingreport.com/immigration.htm.

In recent years, many states enacted strict laws regarding immigrants, including the denial of schooling and various social services to unauthorized immigrant families. Arizona, Georgia, and Alabama enacted some of the most restrictive legislation.

Arizona is one of several states that have enacted very restrictive laws regarding immigration.

Image courtesy of Nevele Otseog, http://www.flickr.com/photos/45976898@N02/4574551377/.

Arizona’s law, passed in 2010, made failing to carry immigration documents a crime and required the police to question and detain anyone they suspected of being an illegal immigrant. Previously, these restrictions had been the sole province of the federal government. Critics charged this new law would lead to ethnic and racial profiling, as only people who looked Mexican would be stopped by police for suspicion of being illegal (Archibold, 2010).Archibold, R. C. (2010, April 24). Arizona enacts stringent law on immigration. New York Times, p. A1. They also noted that the new law caused an economic loss of $250 million during the first year after its enactment from a loss in conference and convention business in Arizona (Brown, 2011).Brown, R. (2011, May 14). Georgia gives police added power to seek out illegal immigrants. New York Times, p. A12.

Georgia’s law, enacted in 2011, allowed police to demand immigration documents from criminal suspects and to hold suspects who do not provide documentation for deportation by federal officials. The law also made it more difficult to hire workers without proper documentation, increased the penalties for businesses that hire these workers, and provided penalties for people who house or transport unauthorized immigrants. Georgia’s Chamber of Commerce worried about the law’s economic impact, and in particular was concerned that the law would reduce tourism. Reports estimated that if the law forced all unauthorized workers to leave Georgia, the state’s agricultural industry would lose up to $1 billion annually, since unauthorized workers form the bulk of the Georgia’s farm labor force (Berman, 2011).Berman, J. (2011, November 28). Georgia immigration law could have dire consequences for state’s economy: Study. The Huffington Post. Retrieved from http://www.huffingtonpost.com/2011/2010/2005/georgia-immigration-law-economy_n_995889.html.

Alabama’s law, enacted in 2011, also allowed police to detain people suspected of being unauthorized immigrants. In addition, it required schools to record the immigration status of all students and also required people seeking a driver’s license to prove that they were US citizens. The law led to very long lines to renew driver’s licenses, and, because immigrant migrant workers left the state, many crops went unharvested on the state’s farms. Business leaders feared the law would harm the state’s economy, a fear that was heightened when a German executive at Mercedes-Benz was detained by police (Ott, 2012).Ott, T. (2012, February 7). Alabama’s immigration law may get a second look. National Public Radio. Retrived from http://www.npr.org/2012/2002/2007/146490508/alabamas-immigration-law-may-get-a-second-look.

Several months after the Alabama law took effect, a study by a University of Alabama economist concluded that it had forced at least 40,000 and perhaps as many as 80,000 unauthorized workers to leave the state (Lee, 2012).Lee, M. J. (2012, February 1). Alabama immigration law costs $11 billion, study shows. Politico. Retrieved from http://www.politico.com/news/stories/0212/72308.html. The exit of so many workers caused an estimated annual loss to Alabama’s GDP of at least $2 billion, a loss in state and state revenue from income and sales taxes of at least $57 million, and a loss in local sales tax revenue of at least $20 million.

Self-Deportation

Many critics of immigration hope these and other laws and practices will make life so difficult for unauthorized immigrants that they engage in self-deportation by returning to Mexico or their other native countries. According to the Immigration Policy Center (2012),Immigration Policy Center. (2012). The real meaning of “self-deportation.” Washington, DC: Author. however, there is little evidence that self-deportation actually occurs. A major reason for this fact is that two-thirds of unauthorized adult immigrants have been in the United States for at least ten years, and almost half are parents of children born in the United States (who, as mentioned earlier, are thus US citizens). These adults and their children therefore have established roots in American soil and simply want to stay in the United States.

Detention

The federal government has the responsibility for detaining and deporting unauthorized immigrants. The number of immigrants detained every year exceeds 360,000, with an average detention length of almost three months; more than 1,000 individuals are detained for over a year. At a cost of more than $60,000 per detainee, the annual cost of this detention system exceeds $21 billion. Most detainees are in custody for technical violations of immigrant laws, such as overstaying a visa, rather than for serious criminal behavior. As such, they do not pose a public danger.

Debate continues over the extent to which the government should carry out deportation, but critics and even immigration judges decry the conditions under which illegal immigrants are detained (Semple, 2011).Semple, K. (2011, December 19). In a study, judges express a bleak view of lawyers representing immigrants. New York Times, p. A24. They say that detainees are denied basic due process rights, such as the right to have a court-appointed attorney. More than four-fifths have no legal representation at all, and those who do receive legal assistance often receive incompetent assistance.

Immigrants and Domestic Violence

Another immigration issue concerns battered women who are immigrants (Constable, 2012).Constable, P. (2012, February 8). For battered immigrant women, fear of deportation becomes abusers’ weapon, but 2 laws can overcome that. The Washington Post. Retrieved from http://www.washingtonpost.com/local/for-battered-immigrant-women-fear-of-deportation-becomes-abusers-weapon/2012/01/30/gIQAZCx3zQ_story.html. When women are beaten or otherwise abused by their husbands or boyfriends, it is often difficult for them to leave their abusers (see Chapter 10 "The Changing Family"). But abused immigrant women face a special problem in this regard. Because often they are allowed to live in the United States only because their husbands are legal residents or citizens, they fear deportation if they go to the police and their husband is deported. Other abused immigrant women who are in the United States illegally similarly fear they will be deported if they go to the police. Fortunately, federal law now allows abused immigrant women to apply for legal residency, but many women are not aware of this possibility.

Although our discussion of immigration has painted a critical portrait of many aspects of US immigration policy, the United States actually ranks fairly high among the world’s nations in how it treats its immigrants. The Note 15.17 "Lessons from Other Societies" box discusses this international comparison in greater detail.

Human Activity and Decision Making

Perhaps more than anything else, environmental sociologists emphasize that environmental problems are the result of human decisions and activities that harm the environment. Masses of individuals acting independently of each other make decisions and engage in activities that harm the environment, as when we leave lights on, keep our homes too warm in the winter or too cool in the summer, and drive motor vehicles that get low gas mileage. Corporations, government agencies, and other organizations also make decisions and engage in practices that greatly harm the environment. Sometimes individuals and organizations know full well that their activities are harming the environment, and sometimes they just act carelessly without much thought about the possible environmental harm of their actions. Still, the environment is harmed whether or not individuals, corporations, and governments intend to harm it.

A major example of the environmental harm caused by human activity was the British Petroleum (BP) oil spill that began in April 2010 when an oil rig leased by BP exploded in the Gulf of Mexico and eventually released almost 5 million barrels of oil (about 200 million gallons) into the ocean. Congressional investigators later concluded that BP had made a series of decisions that “increased the danger of a catastrophic well,” including a decision to save money by using an inferior casing for the well that made an explosion more likely. A news report paraphrased the investigators as concluding that “some of the decisions appeared to violate industry guidelines and were made despite warnings from BP’s own employees and outside contractors” (Fountain, 2010, p. A1).Fountain, H. (2010, June 15). Documents show risky decisions before BP blowout. New York Times, p. A1.

Sociologists McCarthy and King (2009)McCarthy, D., & King, L. (2009). Introduction: Environmental problems require social solutions. In L. King & D. McCarthy (Eds.), Environmental Sociology: From Analysis to Action (2nd ed., pp. 1–22). Lanham, MD: Rowman & Littlefield. cite several other environmental accidents that stemmed from reckless decision making and natural disasters in which human decisions accelerated the harm that occurred. One accident occurred in Bhopal, India, in 1984, when a Union Carbide pesticide plant leaked forty tons of deadly gas. Between 3,000 and 16,000 people died immediately and another half million suffered permanent illnesses or injuries. A contributing factor for the leak was Union Carbide’s decision to save money by violating safety standards in the construction and management of the plant.

The April 2010 BP oil spill occurred after BP made several decisions that may have increased the possibility of a catastrophic explosion of the well.

Image courtesy of International Bird Rescue Research Center, http://www.flickr.com/photos/ibrrc/4670207222.

A second preventable accident was the 1989 Exxon Valdez oil tanker disaster, in which the tanker hit ground off the coast of Alaska and released 11 million gallons of oil into Prince William Sound. Among other consequences, the spill killed hundreds of thousands of birds and marine animals and almost destroyed the local fishing and seafood industries. The immediate cause of the accident was that the ship’s captain was an alcoholic and left the bridge in the hands of an unlicensed third mate after drinking five double vodkas in the hours before the crash occurred. Exxon officials knew of his alcoholism but let him command the ship anyway. Also, if the ship had had a double hull (one hull inside the other), it might not have cracked on impact or at least would have released less oil, but Exxon and the rest of the oil industry had successfully lobbied Congress not to require stronger hulls.

Hurricane Katrina was a more recent environmental disaster in which human decision making resulted in a great deal of preventable damage. After Katrina hit the Gulf Coast and especially New Orleans in August 2005, the resulting wind and flooding killed more than 1,800 people and left more than 700,000 homeless. McCarthy and King (2009, p. 4)McCarthy, D., & King, L. (2009). Introduction: Environmental problems require social solutions. In L. King & D. McCarthy (Eds.), Environmental sociology: From analysis to action (2nd ed., pp. 1–22). Lanham, MD: Rowman & Littlefield. attribute much of this damage to human decision making: “While hurricanes are typically considered ‘natural disasters,’ Katrina’s extreme consequences must be considered the result of social and political failures.” Long before Katrina hit, it was well known that a major flood could easily breach New Orleans levees and have a devastating impact. Despite this knowledge, US, state, and local officials did nothing over the years to strengthen or rebuild the levees. In addition, coastal land that would have protected New Orleans had been lost over time to commercial and residential development. In short, the flooding after Katrina was a human disaster, not a natural disaster.

Environmental Inequality and Environmental Racism

A second emphasis of environmental sociology is environmental inequality and the related concept of environmental racism. Environmental inequalityThe disproportionate exposure of low-income people and people of color to various environmental problems. (also called environmental injustice) refers to the fact that low-income people and people of color are disproportionately likely to experience various environmental problems, while environmental racismThe disproportionate exposure of people of color to various environmental problems. refers just to the greater likelihood of people of color to experience these problems (Walker, 2012).Walker, G. (2012). Environmental justice: Concepts, evidence, and politics. New York, NY: Routledge. The term environmental justiceScholarship on environmental inequality and racism, and public policy efforts and activism aimed at reducing these forms of inequality and racism. refers to scholarship on environmental inequality and racism and to public policy efforts and activism aimed at reducing these forms of inequality and racism. The Note 15.25 "Applying Social Research" box discusses some very significant scholarship on environmental racism.

According to the American Sociological Association report mentioned earlier, the emphasis of environmental sociology on environmental inequality reflects the emphasis that the larger discipline of sociology places on social inequality: “A central finding of sociology is that unequal power dynamics shape patterns of social mobility and access to social, political, and economic resources” (Nagel et al., 2010, p. 17).Nagel, J., Dietz, T., & Broadbent, J. (Eds.). (2010). Workshop on sociological perspectives on global climate change. Washington, DC: National Science Foundation. The report adds that global climate change will have its greatest effects on the poorest nations: “Many of the countries least responsible for the rise in greenhouse gases will be most likely to feel its impacts in changes in weather, sea levels, health care costs, and economic hardships” (Nagel et al., 2010, p. 17).Nagel, J., Dietz, T., & Broadbent, J. (Eds.). (2010). Workshop on sociological perspectives on global climate change. Washington, DC: National Science Foundation.

Examples of environmental racism and inequality abound. Almost all the hazardous waste sites we discuss later in this chapter are located in or near neighborhoods and communities that are largely populated by low-income people and people of color. When factories dump dangerous chemicals into rivers and lakes, the people living nearby are very likely to be low-income and of color. Around the world, the people most affected by climate change and other environmental problems are those in poor nations and, even within those nations, those who are poorer rather than those who are wealthier.

Some evidence shows that although low-income people are especially likely to be exposed to environmental problems, this exposure is even more likely if they are people of color than if they are white. As a review of this evidence concluded, “It would be fair to summarize this body of work as showing that the poor and especially the nonwhite poor bear a disproportionate burden of exposure to suboptimal, unhealthy environmental conditions in the United States. Moreover, the more researchers scrutinize environmental exposure and health data for racial and income inequalities, the stronger the evidence becomes that grave and widespread environmental injustices have occurred throughout the United States” (Evans & Kantrowitz, 2002, p. 323).Evans, G. W., & Kantrowitz, E. (2002). Socioeconomic status and health: The potential role of environmental risk exposure. Annual Review of Public Health, 23(1), 303.

As should be apparent from the discussion in this section, the existence of environmental inequality and environmental racism shows that social inequality in the larger society exposes some people much more than others to environmental dangers. This insight is one of the most important contributions of environmental sociology.

Global climate change is very likely to have its greatest impact on people in the poorest nations, even though these nations are the least responsible for greenhouse gases.

Image courtesy of Hamed Saber, http://www.flickr.com/photos/hamed/266139764.

Air Pollution

Estimates of the annual number of US deaths from air pollution range from a low of 10,000 to a high of 60,000 (Reiman & Leighton, 2010).Reiman, J., & Leighton, P. (2010). The rich get richer and the poor get prison: Ideology, class, and criminal justice (9th ed.). Upper Saddle River, NJ: Prentice Hall. The worldwide toll is much greater, and the World Health Organization (2011)World Health Organization. (2011). Air quality and health. Retrieved from http://www.who.int/mediacentre/factsheets/fs313/en/index.html. estimates that 1.3 million people across the globe die every year from air pollution.

These deaths stem from the health conditions that air pollution causes, including heart disease, lung cancer, and respiratory disease such as asthma. Most air pollution stems from the burning of fossil fuels such as oil, gas, and coal. This problem occurs not only in the wealthy industrial nations but also in the nations of the developing world; countries such as China and India have some of the worst air pollution. In developing nations, mortality rates of people in cities with high levels of particulate matter (carbon, nitrates, sulfates, and other particles) are 15–50 percent higher than the mortality rates of those in cleaner cities. In European countries, air pollution is estimated to reduce average life expectancy by 8.6 months. The World Health Organization (2011)World Health Organization. (2011). Air quality and health. Retrieved from http://www.who.int/mediacentre/factsheets/fs313/en/index.html. does not exaggerate when it declares that air pollution “is a major environmental health problem affecting everyone in developed and developing countries alike.”

Pollution of many types especially harms children’s health. The Note 15.26 "Children and Our Future" box discusses this harm in greater detail.

Global Climate Change

The burning of fossil fuels also contributes to global climate change, often called global warming, thanks to the oft-discussed greenhouse effect caused by the trapping of gases in the atmosphere that is turning the earth warmer, with a rise of almost 1°C during the past century. In addition to affecting the ecology of the earth’s polar regions and ocean levels throughout the planet, climate change threatens to produce a host of other problems, including increased disease transmitted via food and water, malnutrition resulting from decreased agricultural production and drought, a higher incidence of hurricanes and other weather disasters, and extinction of several species (Gillis & Foster, 2012; Zimmer, 2011).Gillis, J., & Foster, J. M. (2012, March 29). Weather runs hot and cold, so scientists look to the ice. New York Times, p. A1; Zimmer, C. (2011, April 5). Multitude of species face climate threat. New York Times, p. D1. All these problems have been producing, and will continue to produce, higher mortality rates across the planet. The World Health Organization (2010)World Health Organization. (2010). Climate change and health. Retrieved from http://www.who.int/mediacentre/factsheets/fs266/en/index.html. estimates that climate change causes more than 140,000 excess deaths worldwide annually.

Climate change is causing many problems, including weather disasters such as the one depicted here.

© Thinkstock

Another problem caused by climate change may be interpersonal violence and armed conflict (Agnew, 2012; Fisman & Miguel, 2010; Kristof, 2008),Agnew, R. (2012). Dire forecast: A theoretical model of the impact of climate change on crime. Theoretical Criminology, 16, 21–42; Fisman, R., & Miguel, E. (2010). Economic gangsters: Corruption, violence, and the poverty of nations. Princeton, NJ: Princeton University Press; Kristof, N. D. (2008, April 13). Extended forecast: Bloodshed. New York Times. Retrieved from http://www.nytimes.com/2008/04/13/opinion/13kristof.html. already discussed as a consequence of population growth. Historically, when unusual weather events have caused drought, flooding, or other problems, violence and armed conflict have resulted. For example, witch-burnings in medieval Europe accelerated when extremely cold weather ruined crops and witches were blamed for the problem. Economic problems from declining farm values are thought to have increased the lynchings of African Americans in the US South. As crops fail from global warming and reduced rainfall in the years ahead, African populations may plunge into civil war: According to an Oxford University economist, having a drought increases by 50 percent the chance that an African nation will have a civil war a year later (Kristof, 2008).Kristof, N. D. (2008, April 13). Extended forecast: Bloodshed. New York Times. Retrieved from http://www.nytimes.com/2008/04/13/opinion/13kristof.html.

As we consider climate change, it is important to keep in mind certain inequalities mentioned earlier (McNall, 2011).McNall, S. G. (2011). Rapid climate change: Causes, consequences, and solutions. New York, NY: Routledge. First, the world’s richest nations contribute more than their fair share to climate change. The United States, Canada, France, Germany, and the United Kingdom compose 15 percent of the world’s population but are responsible for half of the planet’s carbon dioxide emissions. Second, the effects of climate change are more severe for poor nations than for rich nations. Africans, for example, are much less able than Americans to deal with the effects of drought, weather disasters, and the other problems caused by climate change.

Although almost all climate scientists believe that climate change is a serious problem and stems from human behavior, 28 percent of Americans in a November 2011 poll responded “no” when asked, “Is there solid evidence the earth is warming?” Another 18 percent said solid evidence does exist but that global warming is occurring because of “natural patterns” rather than “human activity.” Only 38 percent agreed with climate scientists’ belief that global warming exists and that it arises from human activity (Pew Research Center, 2011).Pew Research Center. (2011). Modest rise in number saying there is “solid evidence” of global warming. Washington, DC: Author.

Overall, 63 percent of respondents agreed that solid evidence of global warming exists (leaving aside the question of why it is occurring). This figure differed sharply by political party preference, however: Whereas 77 percent of Democrats said solid evidence exists, only 43 percent of Republicans and 63 percent of Independents shared this opinion. Similarly, whereas 55 percent of Democrats said global warming is a “very serious” problem, only 14 percent of Republicans and 39 percent of Independents felt this way (Pew Research Center, 2011).Pew Research Center. (2011). Modest rise in number saying there is “solid evidence” of global warming. Washington, DC: Author.

Water Pollution and Inadequate Sanitation

Water quality is also a serious problem. Drinking water is often unsafe because of poor sanitation procedures for human waste in poor nations and because of industrial discharge into lakes, rivers, and streams in wealthy nations. Inadequate sanitation and unsafe drinking water cause parasitic infections and diseases such as diarrhea, malaria, cholera, intestinal worms, typhoid, and hepatitis A. The World Health Organization estimates that unsafe drinking water and inadequate sanitation cause the following number of annual deaths worldwide: (a) 2.5 million deaths from diarrhea, including 1.4 million child deaths from diarrhea; (b) 500,000 deaths from malaria; and (c) 860,000 child deaths from malnutrition. At least 200 million more people annually suffer at least one of these serious diseases due to inadequate sanitation and unsafe drinking water (Cameron, Hunter, Jagals, & Pond, 2011; Prüss-Üstün, Bos, Gore, & Bartram, 2008).Cameron, J., Hunter, P., Jagals, P., & Pond, K. (Eds.). (2011). Valuing water, valuing livelihoods. London, United Kingdom: World Health Organization; Prüss-Üstün, A., Bos, R., Gore, F., & Bartram, J. (2008). Safer water, better health: Costs, benefits, and sustainability of interventions to protect and promote health. Geneva, Switzerland: World Health Organization.

Nuclear Power

Nuclear power has been an environmental controversy at least since the 1970s. Proponents of nuclear power say it is a cleaner energy than fossil fuels such as oil and coal and does not contribute to global warming. Opponents of nuclear power counter that nuclear waste is highly dangerous no matter how it is disposed, and they fear meltdowns that can result if nuclear power plant cores overheat and release large amounts of radioactive gases into the atmosphere.

The most serious nuclear plant disaster involved the Chernobyl plant in Ukraine in 1986. Chernobyl’s core exploded and released radioactive gases into the atmosphere that eventually spread throughout Europe. The amount of radiation released was four hundred times greater than the amount released by the atomic bomb that devastated Hiroshima at the end of World War II. About five-dozen people (Chernobyl workers or nearby residents) soon died because of the disaster. Because radiation can cause cancer and other health problems that take years to develop, scientists have studied the health effects of the Chernobyl disaster for the last quarter-century. According to the United Nations Scientific Committee of the Effects of Atomic Radiation (UNSCEAR), an estimated 27,000 additional cancer deaths worldwide will eventually result from the Chernobyl disaster (Gronlund, 2011).Gronlund, L. (2011). How many cancers did Chernobyl really cause?—updated version. Cambridge, MA: Union of Concerned Scientists.

Seven years earlier in March 1979, a nuclear disaster almost occurred in the United States at the Three Mile Island plant in central Pennsylvania. A series of technological and human failures allowed the plant’s core to overheat to almost disastrous levels. The nation held its breath for several days while officials sought to bring the problem under control. During this time, some 140,000 people living within twenty miles of the plant were evacuated. The near disaster severely weakened enthusiasm for nuclear power in the United States, and the number of new nuclear plants dropped sharply in the ensuing two decades (Fischer, 1997).Fischer, D. (1997). History of the International Atomic Energy Agency: The first forty years. Vienna, Austria: Internatinal Atomic Energy Agency.

Japan was the site of the worst nuclear disaster since Chernobyl in March 2011, when an earthquake and tsunami seriously damaged a nuclear plant in the Fukushima region, 155 miles north of Tokyo. More than 80,000 residents had to be evacuated because of the massive release of radioactive gases and water, and they remained far from their homes a year later as high levels of radiation continued to be found in the evacuated area. A news report on the anniversary of the disaster described the desolation that remained: “What’s most striking about Japan’s nuclear exclusion zone is what you don’t see. There are no people, few cars, no sign of life, aside from the occasional livestock wandering empty roads. Areas once home to 80,000 people are now ghost towns, frozen in time. Homes ravaged from the powerful earthquake that shook this region nearly a year ago remain virtually untouched. Collapsed roofs still block narrow streets. Cracked roads make for a bumpy ride” (Fujita, 2012).Fujita, A. (2012, February 6). Japan’s nuclear exclusion zone shows few signs of life. ABC News. Retrieved from http://abcnews.go.com/International/fukushimas-nuclear-exclusion-zone-shows-signs-life/story?id=15521091#.TzFSXONSRyc. It will take at least thirty years to fully decommission the damaged reactors at Fukushima. The news report said, “This nuclear wasteland may not be livable for decades” (Fujita, 2012).Fujita, A. (2012, February 6). Japan’s nuclear exclusion zone shows few signs of life. ABC News. Retrieved from http://abcnews.go.com/International/fukushimas-nuclear-exclusion-zone-shows-signs-life/story?id=15521091#.TzFSXONSRyc.

In February 2012, the US Nuclear Regulatory Commission (NRC) issued a study that said the risk from nuclear power accidents in the United States was “very small.” If an accident should occur, the NRC concluded, plant operators would have time to cool down reactor cores and prevent or reduce the emission of radiation (DiSavino, 2012).DiSavino, S. (2012, February 1). Nuclear accidents pose little risk to health: NRC. Reuters. Retrieved from http://www.reuters.com/article/2012/02/01/us-utilities-nuclear-accidentstudy-idUSTRE8101ZA20120201. However, the Union of Concerned Scientists (UCS) is more concerned about this risk (Union of Concerned Scientists, 2011).Union of Concerned Scientists. (2011). Nuclear reactor crisis in Japan FAQs. Retrieved from http://www.ucsusa.org/nuclear_power/nuclear_power_risk/safety/nuclear-reactor-crisis-faq.html#us-plant-risk. It says that several US reactors are of the same design as the Fukushima reactors and thus potentially at risk for a similar outcome if damaged by an earthquake. According to the UCS, “If [these reactors] were confronted with a similar challenge, it would be foolish to assume the outcome would not also be similar.” It adds that although earthquakes can cause fires at reactors, US plants routinely violate fire protection standards. A news report on the similarities between US nuclear power plants and the Fukushima plant reached a similar conclusion, noting that US nuclear power plants “share some or all of the risk factors that played a role at Fukushima” (Zeller, 2011).Zeller, T., Jr. (2011, March 14). US nuclear plants have same risks, and backups, as Japan counterparts. New York Times, p. A10.

Critics say many US nuclear plants lack adequate protection against several kinds of dangers.

© Thinkstock

As this conclusion implies, nuclear power critics say NRC oversight of the nuclear industry is too lax. A 2011 investigation by the Associated Press (AP) yielded support for this criticism (Donn, 2011).Donn, J. (2011, June 20). As nuclear plants age, NRC loosens safety regulations. The Boston Globe, p. A2. The AP found that the NRC has been “working closely with the nuclear power industry to keep the nation’s aging reactors operating within safety standards by repeatedly weakening those standards or simply failing to enforce them.” The report continued, “Time after time, officials at the [NRC] have decided that original regulations were too strict, arguing that safety margins could be eased without peril.” For example, when certain valves at nuclear plants leaked, the NRC revised its regulations to permit more leakage. Also, when cracking of steam generator tubes allowed radiation to leak, standards on tubing strength were weakened. And when reactors began to violate temperature standards, the NRC almost doubled the permitted temperatures. The investigation found “thousands” of problems in aging reactors that it said the NRC have simply ignored, and it concluded that a “cozy relationship” exists between the NRC and the nuclear industry.

A retired NRC engineer interviewed by the AP agreed that his former employer too often accommodated the nuclear industry by concluding that existing regulations are overly stringent. “That’s what they say for everything, whether that’s the case or not,” the engineer said. “They say ‘We have all this built-in conservatism.’”

Ground Pollution and Hazardous Waste

Pollution of the air and water is an environmental danger, as we saw earlier, but so is pollution of the ground from hazardous waste. Hazardous wastes are unwanted materials or byproducts that are potentially toxic. If discarded improperly, they enter the ground and/or bodies of water and eventually make their way into the bodies of humans and other animals and/or harm natural vegetation.

Love Canal, an area in Niagara Falls, New York, was the site of chemical dumping that led to many birth defects and other health problems.

Image courtesy of US Environmental Protection Agency, http://commons.wikimedia.org/wiki/File:Love_Canal_protest.jpg.

Two major sources of hazardous waste exist: (1) commercial products such as pesticides, cleaning fluids, and certain paints, batteries, and electronics and (2) byproducts of industrial operations such as solvents and wastewater. Hazardous waste enters the environment through the careless actions of homeowners and other consumers, and also through the careless actions of major manufacturing corporations. It can cause birth defects, various chronic illnesses and conditions, and eventual death.

Sometimes companies have dumped so much hazardous waste into a specific location that they create hazardous waste sites. These sites are defined as parcels of land and water that have been contaminated by the dumping of dangerous chemicals into the ground by factories and other industrial operations. The most famous (or rather, infamous) hazardous waste site in the United States is undoubtedly Love Canal, an area in a corner of Niagara Falls, New York. During the 1940s and 1950s, a chemical company dumped 20,000 tons of toxic chemicals into the canal and then filled it in with dirt and sold it for development to the local school board. A school and more than eight hundred homes, many of them low income, were later built just near the site. The chemicals eventually leached into the groundwater, yards, and basements of the homes, reportedly causing birth defects and other health problems. (See Note 15.27 "People Making a Difference".)

The Superfund program of the US Environmental Protection Agency (EPA), begun about thirty years ago, monitors and cleans up hazardous waste sites throughout the country. Since its inception, the Superfund program has identified and taken steps to address more than 1,300 hazardous waste sites. About 11 million people live within one mile of one of these sites.

Oceans

The world’s oceans are at peril for several reasons, with “potentially dire impacts for hundreds of millions of people across the planet,” according to a news report (ScienceDaily, 2010).ScienceDaily. (2010, June 19). Ocean changes may have dire impact on people. ScienceDaily. Retrieved from http://www.sciencedaily.com/releases/2010/06/100618103558.htm. A major reason is that overfishing of fish and mammals has dramatically reduced the supply of certain ocean animals. This reduction certainly makes it difficult for people to eat certain fishes at restaurants or buy them at supermarkets, but a far more important problem concerns the ocean food chain (Weise, 2011).Weise, E. (2011, July 15). Predator loss can start food-chain reaction. USA Today, p. 9A. As the supply of various ocean animals has dwindled, the food supply for the larger ocean animals that eat these smaller animals has declined, putting the larger animals at risk. And as the number of these larger animals has declined, other animals that prey on these larger animals have had to turn to other food sources or not have enough to eat. This chain reaction in the ocean food chain has serious consequences for the ocean’s ecosystem.

One example of this chain reaction involves killer whales and sea otters in the ocean off of western Alaska (Weise, 2011).Weise, E. (2011, July 15). Predator loss can start food-chain reaction. USA Today, p. 9A. Killer whales eat many things, but sea lions and harbor seals form a key part of their diet. However, the supply of these ocean mammals in western Alaska and elsewhere has decreased because of human overfishing of their prey fish species. In response, killer whales have been eating more sea otters, causing a 90 percent decline in the number of sea otters in western Alaska. Because sea otters eat sea urchins, the loss of sea otters in turn has increased the number of sea urchins there. And because sea urchins consume kelp beds, kelp beds there are disappearing, removing a significant source of food for other ocean life (Estes et al., 2011).Estes, J. A., Terborgh, J., Brashares, J. S., Power, M. E., Berger, J., Bond, W. J., et al. (2011). Trophic downgrading of planet Earth. Science, 333(6040), 301–306.

Another example of the ocean chain reaction concerns whales themselves. The whaling industry that began about 1,000 years ago and then intensified during the eighteenth century severely reduced the number of whales and made right whales almost extinct. In southern oceans, whale feces are an important source of nutrients for very small animals and plankton. As the whale population in these oceans has declined over the centuries, these animals and plankton that are essential for the ocean’s ecosystem have suffered immeasurable losses (Weise, 2011).Weise, E. (2011, July 15). Predator loss can start food-chain reaction. USA Today, p. 9A.

Bycatch. In addition to overfishing, bycatch, or the unintentional catching and killing of fish, marine mammals, sea turtles, and seabirds while other fish are being caught, also endangers hundreds of ocean species and further contributes to the chain reaction we have described. The US National Oceanic and Atmospheric Administration (2012)National Oceanic and Atmospheric Administration. (2012). National bycatch program. Retrieved February 13, 2012, from http://www.nmfs.noaa.gov/by_catch/index.htm. says that bycatch “can have significant social, environmental, and economic impacts.” It costs the fishing industry much time and money, it threatens many ocean species, and it endangers the ocean’s ecosystem.

A familiar bycatch example to many Americans is the accidental catching and killing of dolphins when tuna are being caught by large fishing nets. A less familiar example involves sea turtles. These animals’ numbers have declined so steeply in recent decades that six of the seven species of sea turtles are in danger of extinction. The major reason for this danger is bycatch from shrimp trawl nets and other types of fishing. This bycatch has killed millions of sea turtles since 1990 (Viegas, 2010).Viegas, J. (2010, April 6). Millions of sea turtles captured, killed by fisheries. Discovery News. Retrieved from http://news.discovery.com/animals/turtles-bycatch-fishing.html.

Climate change. Other ocean problems stem from climate change. The oceans’ coral reefs are among the most colorful and beautiful sights in the world. More important, they are an essential source of nutrients for the oceans’ ecosystem and a major source of protein for 500 million people. They help protect shorelines from natural disasters such as tsunamis, and they attract tens of billions of dollars in tourism.

The decline of the whale population due to the whaling industry threatens the world’s supply of plankton and other very small marine animals.

Image courtesy of Joel T. Barkan.

Despite all these benefits, coral reefs have long been endangered by overfishing, tourism, and coastal development, among other factors. Scientists have now found that climate change is also harming coral reefs (Rudolf, 2011).Rudolf, J. C. (2011, June 5). Under the sea, coral reefs in peril. New York Times, p. WK3. The global warming arising from climate change is overheating coral reefs throughout the world. This overheating in turn causes the reefs to expel the algae they consume for food; the algae are also responsible for the reefs’ bright colors. The reefs then turn pale and die, and their deaths add to the ocean’s food chain problem already discussed. Scientists estimate that three-fourths of the earth’s reefs are at risk from global warming, and that one-fifth of all reefs have already been destroyed. They further estimate that almost all reefs will be at risk by 2050.

Global warming will continue to be a main culprit in this regard, but so will increasing acidity, yet another problem arising from climate change. As carbon dioxide is released into the atmosphere, much of it falls into the ocean. This lowers the oceans’ pH level and turns the oceans more acidic. This increasing acidity destroys coral reefs and also poses a risk to commercial species such as clams, lobsters, and mussels.

An additional ocean problem stemming from climate change is rising sea levels (Daley, 2011).Daley, B. (2011, April 3). Fighting a losing battle with the sea. Boston.com. Retrieved from http://www.boston.com/news/science/articles/2011/04/03/fighting_a_losing_battle_with_the_sea. Global warming has caused polar ice caps to melt and the seas to rise. This problem means that storm surges during severe weather are becoming an ever-greater problem. Even without storm surges, much coastal land has already been lost to rising ocean levels. Despite these problems, many coastal communities have failed to build adequate barriers that would minimize damage from ocean flooding.

Food

This chapter discussed food shortages earlier as a population problem, but food can also be an environmental hazard. Simply put, food is often unsafe to eat. In 2011, at least 31 Europeans died from a rare strain of E. coli, a deadly bacterium, and more than 3,000 became very ill; the culprit was contaminated bean sprouts (CNN, 2011).CNN. (2011, June 10). E. coli death toll rises to 31; sprouts traced to trash in home. CNN World. Retrieved from http://articles.cnn.com/2011-06-10/world/europe.e.coli_1_coli-outbreak-sprouts-german-health?_s=PM:WORLD. According to the Centers for Disease Control and Prevention, 325,000 Americans are hospitalized annually because of illnesses contracted from contaminated food, and 5,000 Americans die each year from these illnesses (Kristof, 2011).Kristof, N. D. (2011, June 12). When food kills. New York Times, p. WK10.

The deadly bacteria at fault often result from improper handling and other activities related to growing livestock and processing food. But they also result from the fact that livestock are routinely given antibiotics to keep them healthy despite the crowded and often dirty conditions in which they live. However, this wide use of antibiotics allows bacteria resistant to antibiotics to grow. When humans contract illnesses from these bacteria, antibiotics do not relieve the illnesses (Kristof, 2012).Kristof, N. (2012, April 5). Arsenic in our chicken? New York Times, p. A23.

One journalist pointed out the obvious problem: “We would never think of trying to keep our children healthy by adding antibiotics to school water fountains, because we know this would breed antibiotic-resistant bacteria. It’s unconscionable that Big Ag [Big Agriculture] does something similar for livestock” (Kristof, 2011, p. WK10).Kristof, N. D. (2011, June 12). When food kills. New York Times, p. WK10. A member of the US House of Representatives who is also a microbiologist agreed: “These statistics tell the tale of an industry that is rampantly misusing antibiotics in an attempt to cover up filthy, unsanitary living conditions among animals. As they feed antibiotics to animals to keep them healthy, they are making our families sicker by spreading these deadly strains of bacteria” (Kristof, 2011, p. WK10).Kristof, N. D. (2011, June 12). When food kills. New York Times, p. WK10.