[b]In demographics, the world population [/b]is the total number of humans currently living. The world population was estimated to have reached 7.6 billion as of December 2017. The United Nations estimates it will further increase to 11.8 billion by the year 2100. Not surprisingly, the largest countries in the word in terms of population are China & India, with both now having populations of well over a billion.

The United States comes in third with just under 325 million residents. The BRIC countries (Brazil, Russia, India and China), generally regarded as the four major emerging economies expected to dominate in the 21st century, are all in the top ten most populous countries, indicating how important the sheer size of their populations are to their economic expansion. However, a number of countries considered by the International Monetary Fund to be developing countries also have sizeable populations, including Nigeria (over 180 million), Bangladesh (almost 165 million) and Mexico (around 129 million), demonstrating that the issues affecting developing nations span multiple continents.

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