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BBC said:India looks set to overtake China as the world's most populous country from 2028, according to the UnitedNations.
At that point, both nations will number 1.45 billion people each. Subsequently India's population will continue to grow until the middle of the century, while China's slowly declines.
The UN also estimates that the current global population of 7.2 billion will reach 9.6 billion by 2050.
That is a faster rate of growth than previously estimated.
The population growth will be mainly in developing countries, particularly in Africa, the UN says.
The world's 49 least developed countries are projected to double in size from around 900 million people in 2013 to 1.8 billion in 2050, whereas the population of developed regions will remain largely unchanged.
The UN said the reason for the increase in its projection is largely new information on fertility levels in certain high birth rate countries
Large developing countries, such as China, India and Brazil, have seen a rapid fall in the average number of children per woman, but in other nations,
such as Nigeria, Niger, Ethiopia and Uganda, fertility levels remain high.
Nigeria's population is expected to exceed that of the US by the middle of the century, and could start to rival China's by 2100.
China's population is expected to start decreasing after 2030.
"Although population growth has slowed for the world as a whole, this report reminds us that some developing countries, especially in Africa, are still
growing rapidly," commented Wu Hongbo, the UN's Under-Secretary-General for Economic and Social Affairs.
The United Nations publishes an assessment of past, current and future population trends every two years, in a recurrent series known as the World Population Prospects
Researchers have used data for 233 countries and areas to produce Friday's report.
Worrying signs that they now estimate world population to reach close to 10 billion. At least China implemented a smart plan decades ago to start to combat their population spiralling out of control and now that they are a developed nation people are naturally going to have less children anyway. As a country becomes more developed birth rate drops dramatically as there isn't the need to have as many children. India eventually passing China doesn't surprise as they haven't implemented many controls to combat it and they currently lag behind China in the development stakes. Nigeria's line on the chart is pretty scary, never would have predicted them to be able to reach 1 billion when they have less than 200 million now. This shows how vital it is to help convert developing nations into developed nations to combat population growth.
Going to take a long, long time for the world's population to reduce to a sustainable and sensible number. There hasn't been a major pandemic for centuries though so maybe we are due.