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A UN survey expects the world population to boom to 8 billion by 2023

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The world's population will hit a historic milestone in 2023, surpassing the 8 billion population mark, according to the latest findings from the United Nations population survey published on Wednesday. In addition, it's anticipated that more than half of the global population growth by 2050 will originate from sub-Saharan Africa, where fertility rates will measure higher than anywhere else in the world. 

There are also a few notable country-specific findings. In fact, in roughly seven years, India is expected to dethrone China as the world's most populous country. 

But there's another interesting, and perhaps unexpected, trend in regards to Nigeria. Among the ten largest countries worldwide, Nigeria is growing the most rapidly and is projected to surpass the U.S. in becoming the third largest country in the world around 2050. That means in the next three decades, Nigeria will jump from the world's seventh largest to the world's third.

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Nigeria is expected to exponentially increase in terms of population in the coming years.

The majority of world population growth is attributable to a small number of countries, including India, Nigeria, the Democratic Republic of Congo, Pakistan, Ethiopia, the United Republic of Tanzania, U.S., Uganda, and Indonesia. 

These nine countries are anticipated to contribute to half of the world's population growth between 2017 and 2050.

Despite the increasing population, lower fertility results are expected to led to aging populations, The number of persons above the age of 60 is likely to more than double by 2050 and to more than triple by 2100.

As a result, the UN noted a few unintended consequences of aging populations on programs such as health care and pension. 

The UN population survey surfaced about a month after acclaimed physicist Stephen Hawking warned that humanity needs to colonize another planet in the next 100 years to avoid extinction. 

"With climate change, overdue asteroid strikes, epidemics and population growth, our own planet is increasingly precarious," Hawkins said in the BBC documentary "Stephen Hawking: Expedition New Earth."

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