he world's population will increase by 40 per cent to 9.1 billion in 2050, but virtually all the growth will be in the developing world, especially in the 50 poorest countries, the UN Population Division said.
Between 2005 and 2050, eight countries — India, Pakistan, Nigeria, Congo, Bangladesh, Uganda, United States, China and Ethiopia — are likely to contribute half of the world's population increase, it said.
The division's revision on Thursday of earlier estimates said the population in less developed countries is expected to swell from 5.3 billion today to 7.8 billion in 2050. By contrast, the population of richer developed countries will remain mostly unchanged, at 1.2 billion.
"It is going to be a strain on the world," Hania Zlotnik, the division's new Director, told a news conference.
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