The forecasts in the report are in contrast to UN predictions which show the population reaching 9.7 billion in 2050 and peaking at 10.4 billion in the 2080s.
The global population could fall to six billion by the end of the century if there is"unprecedented investment" in tackling poverty and inequality, researchers have said.
On current economic trends, the experts said the population could peak at 8.6 billion in 2050 before dropping back to 7 billion in 2100. The researchers used a modelling system, Earth4All, to explore the two potential outcomes for this century. Per Espen Stoknes, Earth4All project lead and director of the Centre for Sustainability at Norwegian Business School, said:"We know rapid economic development in low-income countries has a huge impact on fertility rates.
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