The word "population" usually denotes all the inhabits of a specified geographical area at a given time. The size, age structure and distribution of a population is the result pf the interactions of fertility, mortality and migration.
The world's population has been estimated at about 300 million in the year A.D 1, which increased to about 500-800 million by 1750 A.D. The average annual growth rate of population during period 1 A.D to 1750 A.D was around 5.6 per 1000 per year, while the growth rate for the period 1750 to 1800 was estimated around 4.4 per 1000 per year. In the beggining of the 19th century world population was esimated to be around one billion. By 1850 the population has already increased by 300 million i.e world population in 1850 was estimated to be 1.3 billion. By 1920 the population reached 2 billion, which was estimated to be 3 billion by 1960(coale 1974). the next billion in world's population was added by 1975. World reached a population of 5 billion by 1987. It has been estimated that the population of the world reached six billion in october 12,1999. And it has been projected that the world's population will reach 9.2 billion by 2050.
The world's population has been estimated at about 300 million in the year A.D 1, which increased to about 500-800 million by 1750 A.D. The average annual growth rate of population during period 1 A.D to 1750 A.D was around 5.6 per 1000 per year, while the growth rate for the period 1750 to 1800 was estimated around 4.4 per 1000 per year. In the beggining of the 19th century world population was esimated to be around one billion. By 1850 the population has already increased by 300 million i.e world population in 1850 was estimated to be 1.3 billion. By 1920 the population reached 2 billion, which was estimated to be 3 billion by 1960(coale 1974). the next billion in world's population was added by 1975. World reached a population of 5 billion by 1987. It has been estimated that the population of the world reached six billion in october 12,1999. And it has been projected that the world's population will reach 9.2 billion by 2050.
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