• Until we have the courage to recognize cruelty for what it is-whether its victim is human or animal-we cannot expect things to be much better in this world... We cannot have peace among men whose hearts delight in killing any living creature. By every act that glorifies or even tolerates such moronic delight in killing we set back the progress of humanity."
    -Rachel Carson (Author of Silent Spring)

Environmental Pollution and Solutions

Recycling - reducing our impact on our Wonderful Planet.

Paper , Plastic, Glass, Cans, Tyres, Composting/Food Gardening

Animal Voice

sad_pigThe best place to find out about animal rights in South Africa - animal-voice.org

Quick Poll

Why did you choose to be a vegetarian..?
What is Population Growth? Print E-mail

• The overall rate of population increase depends on the number of births and deaths, but also on the length of generations -- the age at which women have their first baby.
- For example, if all women had three children with a 15-year average generation time, the rate of population growth would be 2.7%. If the average spacing were 30 years, the growth would drop in half -- to 1.35%.

Population Age Structure:
Birth and death rates do not tell the whole story of population growth. A country's TFR can be below replacement level while the population continues to grow, if there are a disproportionately large number of couples in these younger age groups. That is the situation in Kenya and, to a lesser degree, the United States. The age structure of the population, then, is also an important factor in population change. When a substantial proportion of a country's population is young, high population growth rates in a country are to be expected, even if the average TFR is modest. The reason is that so many females are of  childbearing age, that even a modest average TFR results in a large number of births. 
Fertility Rates:
• Replacement-level fertility = the number of children a couple must bear to replace themselves 
- slightly more than 2 children because some children die before reaching their reproductive years 
- reproducing at this level does NOT mean that population growth stops; there are so many "future parents" already alive that, even at replacement-level, population will continue to grow for many years
• Total fertility rate (TFR) - estimate of the average number of children a woman will have during childbearing years 
- In 1998, the TFR was 2.9 children per woman (1.6 in MDCs & 3.2 in LDCs); still far above replacement level

< Prev   Next >