The population of the Earth is constantly growing in its number. It is the process of reproduction of the people living on Earth as a whole. For the last centuries, the world population faced the quick growth all over the globe. It began its continuous growth after the end of the Great Famine and the Black Death that was in 1350. Since that time, the number of people was increasing until our time. The highest rate of the world population growth occurred during the 1950s. Until the 1970s, the world population grew by a hyperbolic law. Currently, there is a progressive slowdown in the world's population. Earth's resources are able to feed about 100 billion, but it is believed that the world population reaching 8 billion people will cease to grow. Forecast is too optimistic if not eliminating that an excess of the population will be exterminated during the genocide and wars of conquest. In 2009, for the first time in human history, the urban population equaled with the number of rural, reaching 3.4 billion people. It is expected that more and more of the world's population will be presented by the people who live in cities.
Beginning from the 19th century the world population accelerated its growth. In 1804, it reached the number in one billion for the first time. In 1850, it was approximately 1.2 billion people. It was passed only eighty years, and the total world population reached 2 billion people. The world population reached 3 billion people in the next thirty years. The rise of people on the Earth became the usual thing for the next few decades. It was mainly due to the absence of global war conflicts, the development of the economy and improvement in medicine. As a result, the world population reached 7 billion people in 2011. If the world population will keep the tendency to increase in its number all over the world, it is expected that the number of people who will be living on this planet will reach 9 billion people by 2050.
In some way, the growth of the world population occurs because of the development of some countries such as India, China, United States, Brazil and others. Today the most populous country is China. The total number of the residents in the country is approximately 1.35 people. “According to the communiqué, China’s population increased by 6.69 million last year to reach 1.354 billion by the end of 2012” (Na, 3). However, the situation can change by the 2050. It is estimated that the India has all necessary conditions to increase its population and overtake China. The total number of people in India will reach 1.69 billion. It is also expected that the United States of America will take the third position in the list of the most populous countries of the world.
The world population can reach 11 billion people by the end of the 21st century. This is not the exact figure which may change depending on the circumstances. In any case, it will be dependent on the total fertility rate. The total fertility rate is the average number of children born by a woman for life, with the average for women of all ages. “The replacement rate is 2.1. If the average woman has more children than that, populations grows” (Last, 3). The current fertility rate is 2.36. In order to keep the world population lower than 11 billion people by the end of this century, it requires not exceed the total fertility rate of 2.4-2.5. Otherwise, the total world population could reach even more than 11 billion people.