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  2. Population - Wikipedia

    Population typically refers to the number of people in a single area, whether it be a city or town, region, country, continent, or the world. Governments typically quantify the size of the resident population within their jurisdiction using a census, a process of collecting, analysing, compiling, and publishing data regarding a population.

  3. Population growth - Wikipedia

    Population growth is the increase in the number of people in a population or dispersed group. Global human population growth amounts to around 83 million annually, or 1.1% per year. [2] The global population has grown from 1 billion in 1800 to 7.9 billion in 2020. [3] The UN projected population to keep growing, and estimates have put the total ...

  4. Population decline - Wikipedia

    A population decline (also sometimes called underpopulation, depopulation, or population collapse) in humans is a reduction in a human population size. Over the long term, stretching from prehistory to the present, Earth's total human population has continued to grow; however, current projections suggest that this long-term trend of steady population growth may be coming to an end.

  5. Nomad - Wikipedia

    A nomad is a member of a community without fixed habitation who regularly moves to and from the same areas. Such groups include hunter-gatherers, pastoral nomads (owning livestock ), tinkers and trader nomads. [1] [2] In the twentieth century, the population of nomadic pastoral tribes slowly decreased, reaching an estimated 30–40 million ...

  6. Population density - Wikipedia

    Population density is the number of people per unit of area, usually quoted per square kilometer or square mile, and which may include or exclude for example areas of water or glaciers. Commonly this may be calculated for a county, city, country, another territory or the entire world . The world's population is around 7,800,000,000 [4] and ...

  7. Population ageing - Wikipedia

    Population ageing is an increasing median age in a population because of declining fertility rates and rising life expectancy. Most countries have rising life expectancy and an ageing population, trends that emerged first in developed countries but are now seen in virtually all developing countries. That is the case for every country in the ...

  8. Population proportion - Wikipedia

    In statistics, a population proportion, generally denoted by or the Greek letter, is a parameter that describes a percentage value associated with a population. For example, the 2010 United States Census showed that 83.7% of the American population was identified as not being Hispanic or Latino; the value of .837 is a population proportion.