Chapter 5. The Human Population. From Raven & Berg – Chapter 8. Population biology . Principles of Population Ecology. The size of the human population is central to many environmental problems and their solutions Important that we understand how populations increase or decrease
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The Human Population
Based on information about life expectancy, literacy, and living standards
Because of higher birthrates, developing countries represent a larger and larger share of the world’s population
S stands for stewardly concern and practice
Millions of acres of rain forest in Central and South America are being cut down each year to make room for agriculture. Much of this deforestation is done by poor, young people who are seeking an opportunity to get ahead but are untrained and unskilled in the requirements of maintaining tropical soil
Top 10 world metropolitan areas in 2005.
On the outskirts of Sao Paulo, Brazil. 32% of the cities population lives in these blighted areas
Note the large population of ages 30-49
Note how the larger numbers of persons are moving into older age groups and the number of children is decreasing
Projections shift drastically with changes in fertility. Contrast the 1988 projection based on a fertility rate of 1.8, with 2000 projection based on an increased fertility rate of 2.0 and current immigration
TFR = 4.8. Assuming that this fertility rate will gradually decline to 2.7 in 2025,t he population will increase from 29 to 40 million
b/1000 – d/1000 = natural rate of increase
Natural rate of increase / 10 = % increase
A zero growth population is achieved if, the CBR and CDR are equal