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Human population numbers - trends, causes and consequences.

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Human population numbers - trends, causes and consequences. Human population has been developing since thousands of years. About 10,000 years ago, the human population growth remained fairly constant due to disease, famine or natural disasters. This population slowly increased for the next 9,600 years. The Black Death which occurred in the 1330's killed 25 million people between 1347 and 1352. It is also known as the bubonic plague. Since the past 400 years, the human population increases exponentially. One of the ways to calculate this increment is by referring to the doubling time. The doubling time is defined as the number of years required to double an areas' current rate of population growth. Since the 1800's, the doubling time decreased from 100 years to 60 years and finally 25 years. On the other hand, there were three major population explosions. The first one took place about 20,000 years ago due to the tool-making revolution. This was when tools were used for hunting and food-gathering techniques. The second explosion was brought about by agricultural revolution, which was about 6,000 years ago. ...read more.


Physically, there also will be a change in the population numbers. Resources play a major role in this argument. Food and energy must be enough for individuals to carry on living a fairly average life. When supply is insufficient, the number of people will decrease. Space also must be considered in monitoring the population change. In the housing aspect, if there aren't enough dwellings for people to live in, then people will die and again, population numbers will decrease. Migration also affects the population numbers. There are two types of migration, emigration and immigration. Emigration decreases the amount since people will leave the place and immigration will increase the number since people will join the community. Another uncontrollable and unpredicted factor is natural disasters. When this occurs, population numbers will lower down. Finally, the last category, biological aspect, is quite crucial. An increase in birth rate will ensure the augmentation of the population numbers. Birth rate, which is also known as natality, is defined as the number of births divided by the number of adults in the population. ...read more.


These include water pollution, industrial waste, air pollution, and as discussed earlier, deforestation. Desertification often follows deforestation, but that's only in calamitous cases. Greenhouse effect and acid rain are constituents of air pollution. This will cause the earth to become drier and hotter, which ultimately will be troublesome to grow crops. The final consequence will be resources. Food production will be a major problem. Resources also include metals and fossils, which are non-renewable. After using these materials, there will be insufficient supply for the future generation. When a population increases, starvation will be a major problem in that effected area. Individuals will not have sufficient supply of food. Another similar effect will be poverty. This problem will multiply to urbanisation indirectly. The rural areas will convert to urban areas. Certain unfortunate individuals will have no money to sustain life and eventually the population number will decline. Another effect is unemployment. Since there will be so many people, it will be difficult to get a job. These people, who cannot get a job will be frustrated and also can't support their families. Dipesh Remais L 106 1 ...read more.

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