Concept 59 - Concept 52.6 Human population growth has...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Concept 52.6 Human population growth has slowed after centuries of exponential increase The concepts of population dynamics can be applied to the specific case of the human  population. It is unlikely that any other population of large animals has ever sustained so much  population growth for so long. The human population increased relatively slowly until about 1650 when approximately  500 million people inhabited Earth. The Plague took a large number of lives. Since then, human population numbers have doubled three times. The global population now numbers more than 6 billion people, and is increasing by about  73 million each year, or 201,000 people each day. Population ecologists predict a population of 7.3–8.4 billion people on Earth by the year  2025. Although the global population is still growing, the rate of growth began to slow  approximately 40 years ago. The rate of increase in the global population peaked at 2.19% in 1962. By 2003, it had declined to 1.16%. Current models project a decline in overall growth rate to just over 0.4% by 2050. Human population growth has departed from true exponential growth, which assumes a  constant rate. The declines are the result of fundamental changes in population dynamics due to diseases  and voluntary population control. To maintain population stability, a regional human population can exist in one of 2  configurations: Zero population growth = High birth rates  − High death rates. Zero population growth
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

Concept 59 - Concept 52.6 Human population growth has...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online