The growth in the world population has been changing considerably in the last 100 years. The population growth was regarded as slow before 1950. However, the world population managed to record double growth from 1950 within 40 years. The world population shifted from 2.5 billion in 1950 to 5 billion in 1990. By the end of 20th century the world population had managed to reach 6 billion. Currently the world population is estimated to be between 8 billion and 12 billion. This has attributed to decrease in mortality rate across the globe and intense increase in fertility rate and hence the population in the developing nation across the Africa and in Asia. Although the world population is still increasing at the rate of 1.3%, the rate of the population growth is going down. In 1970 the rate of population growth was about 2.1%.
Therefore, the rate of growth is anticipated to continue declining (Globalchange.umich, 2006b). There is a variation in the rate of population growth in different parts of the world. The rate of growth is very low and continues to decline in the developed nations but it is increasing in the developing nations. Although the rate of growth in Asia is anticipated to go down in the future, the rate of population growth in Africa is anticipated to continue growing though at a lower rate. Sudden increase in the world population highly demanded for more land for residential and economic purposes. This resulted to increase in the rate of deforestation and industrializations aspects that have highly contributed to the destruction of different animal and plant species due to destruction of their natural inhabitant and their ecological system (Globalchange.umich, 2006a).
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