World population will exceed 9 billion in 2050

The world's population is expected to exceed 9 billion in 2050. The countries with over 100 million people will be increased to 17. India will replace China to become the world's largest country with a population of 1.6 billion, according to the report titled "State of World Population 2010," which was issued by World Population Fund on Oct. 20.

The world's population is expected to reach to 9.15 billion in 2050, 2.241 billion higher than at present, according to the report. Africa's population will nearly double from 1 billion to almost 2 billion. The population in Asia, which will also have more substantial growth, will grow from 4.2 billion to 5.2 billion. The population in Europe will fall to 691 million from the current 733 million, it will be the only the continent with population decline.

The report also shows that the populations of 11 countries in the world have exceeded 100 million recently. Of these, China has the most, with a population of 1.4 billion, and the next is India with 1.2 billion. Other countries that have a population of more than 100 million are the United States, Indonesia, Brazil, Pakistan, Bangladesh, Nigeria, Russia, Japan and Mexico.