Which countries will double their population by 2050?

More than 50% of the world population growth between now and 2050 is expected to occur in Africa.  Africa has the most significant rate of population increase among other continents.

The population of Sub-Saharan Africa is predicted to double by 2050. Africa to move the world's population towards 10 billion by 2050.

Which countries will double their population by 2050?
First map - Medium-fertility is used; second map - low-fertility variable is used; third map - hight fertility variable is used. (Reddit user: abu_doubleu)

The population of Nigeria, for instance, Nigeria's population is set to double to more than 400 million by 2050, when it has overtaken the United States as the world's 3rd most populous nation.

Reasons for a predicted doubling in population in Sub-Saharan countries include enhanced quality of life combined with no immediate drop in birth rates.
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Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.