HUMAN POPULATION
Human populations have grown exponentially
* 1700s, changes in technology gave humans more control over t...
HUMAN POPULATION
In the future, the world’s population growth will be centered in the parts of the worlds least
equipped t...
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Human population handouts(walang copy ng quiz)

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Human population handouts(walang copy ng quiz)

  1. 1. HUMAN POPULATION Human populations have grown exponentially * 1700s, changes in technology gave humans more control over their food supply. * The human population has grown explosively over the last 300 years. * Birth rate has remained unchanged at about 30 per 1000 per year over this period. * Death rate has fallen dramatically, from 20 per 1000 per year to its present level of 13 per 1000 per year. * A 1.2% annual growth rate may not see large, but it has produced a current human population of nearly 7 billion people. Population pyramids show birth and death trends *Population Pyramid – it is when the rate at which population can be expected to grow in the future that can be assessed graphically. * It displays the age composition by sex. * The number of older females is disproportionately large compared with the number of older males. Humanity’s future growth is uncertain * Humanity is adding 78 million people a year to its population---- over a million every five days, 150 every minute! * A key element in the world’s population growth is its uneven distribution among countries.
  2. 2. HUMAN POPULATION In the future, the world’s population growth will be centered in the parts of the worlds least equipped to deal with the pressures of rapid growth. The population growth rate has declined *Declined from a high of 2% in 1965-1970 to 1.2% in 2008 *78 million per year to 53 million per year Ecological footprints of individuals in different countries United State (highlydeveloped) Brazil (moUderately developed) Ethiopia (poorly developed) Fertility Rate 2.1 1.9 5.3 Doubling time (years) 75 65 29 Infant mortality rate (per 1000births) 6.5 30 95 Life expectancy at birth (years) 78 72 49 Per capita GDP (U.S. $)* $40,100 $8100 $800 Population < 15 years old (%) 21 26 44

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