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The most distinguishing feature of the human population is that it grows and declines, but never stays still. The population of a country increases when the births outnumber the deaths that take place in that specific area. For example a country with a present population of 100 million with 3 million births and 1 million deaths will have a population growth rate of 2%. If this scenario is reversed, then it will result in the increase of the death rate. Now the above mentioned facts do not take into account the immigrants, as not all countries face the immigrant inflows at rapid rates. Due to the growing problems of population, almost all of the countries are now formulating some strict rules and regulations about migration. It is quite corroborated that if the present population growth is not controlled, then till the year 2050 the world population would have crossed the line of demarcation. Not surprisingly, most of the world population is concentrated in the continent of Asia which is because of the two countries, China and India. The focus of this top ten ranking would be to map out the top 10 most populated countries in the world. Below is the list of those countries.

10. Japan (127,799,000)

According to a number of reports and surveys that were conducted in the year 2011, it has been estimated that the population of this country is nearly 127,799,000. These calculations are based on the comparison of the present population with the population that was found in the census of 2010. There is doubt in saying that Japan is facing some compelling problems and issues pertaining to their population. The Japanese authorities have managed to control their population, but this strategy has given rise to yet another problem. The low fertility rate along with the longer life expectancy of the individuals is yielding an older population.

9. Russia (143,100,000)

As of April 1, 2012 the population of Russia has been calculated to be around 143,100,000. According to the recent official estimates the population of Russia represents 2.04 % of the whole population of the world. Unlike most of the countries, Russia is now facing a constant decline in its population. A few years the former President of Russia, Vladimir Putin, had ordered the parliament to construct numerous plans in order to create a reduction in the ever falling birth rates in the country. In the year 1990, the population of Russia used to be 148 million, but now it has fallen to 143 million which is indeed not a good situation for the country. The main reasons behind this constant decline in the population are the increasing death rates, high rates of abortion and low birth rates.

8. Bangladesh (152,518,015)

Based on the calculations of the 2011 census in the country, the population of the country has estimated to be 152,518,015 (nearly 152 million). The population of this country represents 2.17 % of the whole world population. The problem of the increasing population has posed numerous issues for this developing country. Although the life expectancy of both the men and women is nearly the same, but still the birth rates are very high in most of the rural areas. In order to effectively deal with this hanging sword, the government is taking some extreme measures in order to keep the population controlled.

7. Nigeria (166,629,000)

With a population of nearly 166 million, Nigeria is the 7^th most populous country in the world according to a number of different sources. This estimate was carried out by the United Nations through a number of surveys. Presenting 2.37 % of the whole world population, Nigeria faces a number of problems these days like scarcity of resources, low rates of development, corruption, poverty etc. The need for educating the masses and providing them with proper facilities is the need of the hour for the Nigerian Government. They must pass new rules and regulations about birth rates, marriages, abortion etc.

6. Pakistan (180,127,000)

With a population of nearly 180 million, Pakistan is the 6^th most populous country in the world. This population represents 2.56 % of the whole population of the world. With high birth rates, low per capital income, unemployment, poverty, corruption, food shortage, Pakistan needs extreme measures in order to deal with this challenge posed by the increasing population. This is because is a direct relation between overpopulation and low income rates. These two factors give rise to the low investment and high unemployment rates in the country. Although each year the government makes cocky claims about controlling the birth rate, but nothing is actually done in this regard.

5. Brazil (192,376,496)

With a population of nearly 192 million, Brazil is the fifth most populous country in the world. This population estimate was carried out by the IBGE institute by conducting a digital census in the country. It was also revealed that there are 4 million more women than men, which indicates the female population dominance in the country. According to the official estimates and reports, this population represents 2.74 % population of the whole world. Although Brazil has controlled much of its problems and is on the road of becoming a developed country, but still the increasing population is an alarm for the Brazilian Government.

4. Indonesia (237,641,326)

With a population of nearly 237 million, Indonesia has been ranked as the 4^th most populous country in the world. The population of the country represents 3.38 % of the whole world population. The above mentioned estimate is based on the last census that was carried out in the country in the year 2010. Despite of the several family planning techniques and programs, Indonesia has been unable to control the population problem in the country. This problem has in return given rise to several economic as well social problems. Nearly 4.2 million babies are born in the country every year, which shows that the country has one of the highest birth rates in the world. The authorities claim that till the year 2015 they will manage to reduce the fertility rate to 1 child per mother which is presently 2.3 children per mother.

3. United States (313,931,000)

Being one of the most populous countries in the world and with a population of nearly 313 million, The United States of America has been ranked the 3^rd most populous country in the world. Most of the citizens of the country are still unaware of the overpopulation problem and contrary to this awareness the American couples are making 3 to 4 children on an average rate. This is primarily of the propaganda that was created by the U.S media. Later onwards, the Americans will soon realize that the problem of overpopulation is not just the issue in China and India, but with them also. Some of the people even claim that this is not a problem for the United States as we have equipped ourselves with the latest technologies that would come to increase the chain of food supplies. May be, America can manage this problem, but what about the economic meltdown which the country is facing presently. Sooner or later, the government will realize that they need to control their population.

2. India (1,210,193,422)

With a population of nearly 1210 million, India is the 2^nd most populous country in the world. The population of this country represents 17.22 % of the whole world population. The reported figures are based on the last census that was carried out in the country in the year 2011. It can be rightly this problem is indeed the problem of all humanity. According to a number of predictions, it has also been said that till the year 2050 the population of India would have outnumbered the Chinese population by a huge gap. Despite of the rapid economic development, India is still known worldwide for its poverty along with its population. In the initial 20 years of the independence of the country, none of the politicians dared to bring forward a family planning program. With the highest and increasing growth rates, India has been ranked number 1 by a number of surveys and statistical calculations.

1.    China (1,347,350,000)

With a population of nearly 1347 million, China is the most populous country in the world. This population exhibits 19.17 % of the whole world population. Not surprisingly, China these days is facing some great economic as well social problems which are linked with population. This over population has led to a fast degradation in the resources, job opportunities etc. From the year 1979, China has been following the one child policy. According to this policy, the couples who had only child were given special advantages and facilities, while those who gave birth to more than 1 child were indented with a number of taxes and charges. In short, all the pregnancies and abortions were documented first and then authorized by the respective authorities. This policy has is some ways has managed to control the problem of overpopulation in the country.