14-06-2012, 04:28 PM
Current Human Population
Current Human Population.ppt (Size: 1.04 MB / Downloads: 65)
Population Growth
Birth/Death Rates
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 total fertility rate is modest. The reason is that so many females are of childbearing age, that even a modest average total fertility rate results in a large number of births.
Earth Carrying Capacity
Carrying capacity- the maximum population that can be supported by the available resources.
Biological Carrying Capacity about 50 Billion
We strive for a modified population at which a maximum population can be maintained at an acceptable standard of living- Cultural Carrying Capacity.
According to the latest United Nations projections, the most likely scenario for population in 2050 will be around 8.9 billion, and will peak out slightly above 10 billion after 2200.
The population of sub-Saharan Africa provides a clear example of a region suffering from over population. their population is increasing by 3% yearly, while their food supply is only annually growing by 1%. This has led their and several other economically low countries' environments to such extreme conditions as desertification.
Effect of Over Population
As population grows, consumption of valuable resources and pollution increases, which threatens to overwhelm the Earth’s ability to provide for the human race and other life forms.
Overpopulation creates low living standards, outbreaks of civil wars, not enough jobs, poor food supplies, and reduced education standards.