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Related Concept Videos

Population Growth00:57

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
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Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
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Bacterial populations exhibit exponential growth when conditions such as nutrient availability and temperature are favorable. In this phase, cells reproduce through binary fission, where each cell divides into two identical daughter cells. This process causes the population to double at regular intervals, resulting in a growth rate that is directly proportional to the current number of cells. As the population increases, the number of new cells formed during each generation also grows, creating...
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Exponential models are essential for describing rapid, multiplicative changes in natural systems, such as population growth. When a population doubles at regular intervals, the process can be modeled using a suitable base. For instance, a bacterial culture that doubles every three hours follows the model n(t)=n0⋅2t/3, where n(t) is the population at the time t.A more general model uses the natural base e, especially for continuous growth. This takes the form n(t)=n0⋅ert, where r is the relative...
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Collecting samples or responses from an entire population takes significant time and effort, so a researcher collects responses from only a sample of that population. Suppose a study needs to collect information about a specific mobile application. After sample collection, the researcher analyzes the data and discovers that most individuals in the sample use that specific mobile application. The sample proportion measures the number of individuals in a sample who either use or don't use the...
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Quantification of Self-renewal in Murine Mammosphere Cultures
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Quantification of Self-renewal in Murine Mammosphere Cultures

Published on: November 26, 2019

7 billion and counting.

David E Bloom1

  • 1Department of Global Health and Population, Harvard School of Public Health, Harvard University, Boston, MA 02115, USA. dbloom@hsph.harvard.edu

Science (New York, N.Y.)
|July 30, 2011
PubMed
Summary
This summary is machine-generated.

Global population is rapidly changing due to mortality and fertility shifts, with future growth concentrated in developing nations. Historical population increases have not been economically disastrous and can foster prosperity.

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Area of Science:

  • Demography
  • Population Studies
  • Sociology

Background:

  • The world is experiencing unprecedented demographic shifts.
  • Significant reductions in mortality and fertility have led to rapid population growth.
  • Global population doubled between 1960 and 2000, with further increases projected.

Purpose of the Study:

  • To analyze the historical and projected impacts of demographic changes on global well-being.
  • To examine the economic consequences of population dynamics.
  • To explore policy interventions for mediating demographic repercussions.

Main Methods:

  • Analysis of historical demographic data (mortality, fertility rates).
  • Review of economic trends in relation to population changes.
  • Projection of future population growth and its distribution.

Main Results:

  • Historical population growth has not led to economic catastrophe.
  • Changes in population age structure present opportunities for increased prosperity.
  • Future population increases are expected to be concentrated in least developed countries.

Conclusions:

  • Demographic changes profoundly impact human well-being and progress.
  • Population dynamics offer potential pathways to enhanced prosperity.
  • Policy interventions can help manage the repercussions of demographic shifts.