![]() ![]() Today, there are more adolescents and young people than ever before. In high-income countries, migration, rather than fertility, will be the main driver of population dynamics over the next few decades.Īge distribution also affects whether populations expand or contract. On the other hand, the populations of more than 60 countries and areas around the world are projected to shrink between now and 2050 due to falling fertility and, in some cases, increased emigration. Many of the world’s least developed countries have populations projected to double between 20. Some have populations that are expanding – quickly. General population trends mask considerable differences between countries. To more sustainably address the needs of individuals, policymakers must understand how many people are living on the planet, where they are, how old they are, and how many people will come after them. They also impact efforts to ensure universal access to health care, education, housing, sanitation, water, food and energy. They affect economic development, employment, income distribution, poverty and social protections. These megatrends have far-reaching implications. The first year in which more people lived in urban than rural areas was 2007, and by 2050 about 68 per cent of the world population will be living in cities. In addition, the world is seeing high levels of urbanization and accelerating migration. (Global life expectancy actually declined from 73 years in 2019 due mainly to the impacts of the COVID-19 pandemic.) Meanwhile, average global lifespans have risen, from about 64 years in the early 1990s to 71 years in 2021. In the early 1970s, a woman had on average 4.5 children by 2021, the average global fertility rate had fallen to 2.3 children per woman. 10,000 years ago When did the human population begin to grow at a faster rate than at any other time in history? 8,000 years ago The most rapid population growth rate in history resulted from _.The recent past has seen enormous changes in fertility rates and life expectancy. bubonic plague The agricultural revolution took place approximately _. micoorganisms A dramatic decline in the population of Europe in the 1300s was caused by the _. Which is an example of a geometric progression? 4,6,8 The germ theory of disease establish the many diseases are caused by _. cities were densely populated In geometric progression, the ratio of each number to the preceding one is the same. ![]() antibiotics and vaccines were discovered In the past, typhus and other diseases were more common in cities because _. ![]() cutting off food supplies The biomedical revolution of the twentieth century caused population growth because _. the food supply Which led to population growth during the Industrial Revolution? the germ theory of disease A common wartime tactic that can decrease a population is _. pollution The agricultural revolution brought about a situation in which _. gathered food was stored Early human population were controlled by all of these factors except _. Which might represent the arithmetic growth of agricultural production? 2,4,6 An important characteristic of the earliest permanent human settlements what that _. one-half An arithmetic progression involves the addition of the same quantity to each number. famine due to plant diseases The bubonic plague of the fourteenth century reduced England's human population by _. at a slow rate Which was not a result of the agricultural revolution? increased nomadic activity As evidenced in Ireland in the mid-1800s, dependence on one staple food leaves a population vulnerable to _. Since the Industrial Revolution began, the human population has grown _. ![]()
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