Natural Increase:
Understanding the Demographic Transition Model
Crude Birth Rate (CBR): The total number of live births in a year for every 1,000 people.
Crude Death Rate (CDR): The total number of deaths in a year for every 1,000 people.
Natural Increase Rate (NI): The percentage by which a population grows in a year.
As of right now, the population of the world is growing 1.2 percent yearly. The highest all time peak was in 1963, with 2.2 percent. The world population increased 1 million in 14 years, then 1 million in 13 years, and more recently 1 million in 12 years, and it will only continue to grow. The Natural Increase Rate affects the doubling times, which is the number of years it takes to double the population (assuming its a constant rate of natural increase.) The current doubling time is 53 years, with the most help from Asia, which has two-thirds of the world's population growth in the past decade.
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| Demographic Transition Model |
Geographers use the total fertility rate to measure the number of births in a society. It's the number of children a woman will have from the ages of 15-49. The current TFR for the world is 2.7, varying amongst countries.
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| World Fertility Rate (http://commons.wikimedia.org/wiki/File:Fertility_rate_world_map.PNG |
There are two measures of mortality (with exception to the crude death rate), they are infant mortality rate and life expectancy. The infant mortality rate is the annual number of deaths of infants under one year of age, compared to live births. This can reflect the country's healthcare system.
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| Infant Mortality Map (http://commons.wikimedia.org/wiki/File:Infant_mortality_rate_world_map.PNG) |
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| Life Expectancy Map (http://www.chessbase.com/newsdetail.asp?newsid=3064) |
Current Event:
http://www.thefamilygp.com/Scots-life-expectancy-among-worst-in-Europe.htm
This article has to do with life expectancy in the continent with the highest life expectancy in the world. Scotland's current birthrate is 75 years old for men, and 80 for women. With the majority of the Earth's countries with life expectancies under 60 years old, continents like Africa and Asia would be dying (no pun intended) to have a life expectancy so high; however, it's on the contrary. Scotland has the lowest life expectancy in Europe, though still growing. Though this is the case and we are not sure why, it will continue being one of the leaders for the world.
http://www.thefamilygp.com/Scots-life-expectancy-among-worst-in-Europe.htm
This article has to do with life expectancy in the continent with the highest life expectancy in the world. Scotland's current birthrate is 75 years old for men, and 80 for women. With the majority of the Earth's countries with life expectancies under 60 years old, continents like Africa and Asia would be dying (no pun intended) to have a life expectancy so high; however, it's on the contrary. Scotland has the lowest life expectancy in Europe, though still growing. Though this is the case and we are not sure why, it will continue being one of the leaders for the world.
