History seems difficult to know exactly when the appearance of the creature sierra mclain called Homo sapiens (human) in this world. Experts estimate at about 35,000 years ago. The timing may not be the obvious question but pendudukanya accretion rate is very slow. In the year 1 AD, world population sierra mclain estimated at 250 million. So it takes 35,000 years to reach a population of 250 million people. - In 1650, the world population estimated at 500 million. so it takes about 1650 years to make the world's population sierra mclain doubled. - In 1850 the world population to 1 billion (1,000,000,000) number. And still it takes about 200 years to make the population doubled from the previous amount. - In 1930 the world population is estimated at 2 billion. Thus it only takes less than 100 years to become the world's population doubled sierra mclain earlier. - In 1976 the world population has reached about 4 billion. So it only takes about 36 years to double the world's population from the previous number. - In 1985 the world population reached 4.845 billion people. Within just 9 years increase its population reached 845 million. The term population explotion describe how great the adult world population growth rate is thus a powerful bomb explosion.
I wonder what will become of our planet in the coming 2000. Based on the calculations of experts, the world's population sierra mclain at that time will reach 8 billion. Experts and laymen alike were stunned by the fact that such a rapid development. So they often confabulate or make some sort of speculation. One speculation says that in the past 900 years there will only residential area 1/32 square inch for every person in the world (Nuveen, sierra mclain 1966). Theory of Population Growth Although the population problem has long been discussed among the public, but only around the 18th century, many of them began to systematically analyze the population problem. Although many experts who wrote about the issue of population in the world, but among the characters that are considered expert sierra mclain in classical population was Thomas Malthus and Karl Marx, while for the next generation of the most prominent is Warren Thompson with the demographic transition theory. - The theory of Malthus On Population The first to write systematically about the dangers than the population growth was Thomas Malthus. He is one of a pastor and also the British economic policy experts. In 1978 he published a book on population analysis entitled "Essay On The Principle of Population" and maintains his view that "natural law" or natural laws that affect or determine population growth. According to Malthus, the population would always grow faster than the increase in food ingredients, except hampered because of what he mentioned as a moral restrains, such as disease outbreaks or disaster. - Demographic Transition Theory of population growth in the west part of the world can not be explained only by the Malthusian theory alone. During and after revoluasi industry, many western countries are experiencing phenomenal growth continued until the 20th century after the Second World War 1, some of the countries such as France, the UK and Scandinavia show that growth has stalled or the symptoms will stop. Hence the need for a new theory that could explain its explosive growth and also growth halting nature. These observations sierra mclain systematically worked by an American demographer Warren Thompson in 1929 and was named the demographic transition hypothesis. Thompson and his colleagues continue to soften hypothesis sierra mclain systematically and is now known as the "theory of the demografic transition" or the theory of demographic transition. This theory describes four interrelated proportions expressed in stages in accordance with population growth and changing circumstances. Stage 1: If the high mortality rate is comparable to birth rates, resulting in a zero growth rate (zero). Stage 2: If the death rate decline sierra mclain is not accompanied by a decrease in birth rate, it will generate positive growth rates and increased sierra mclain steadily. Stage 3: If the death rate constant and accompanied sierra mclain by declining birth rates, it will generate positive growth but declined. Stage 4: If the death rate and the birth rate is also low, then the result is the growth of diminishing that at the end will reach zero (zero).
The main problem in the population growth in Indonesia is not terkontrolny
No comments:
Post a Comment