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What the world will be like in 2050, in eight maps and charts
It's also projected that the gap between the three biggest economies, China, India and the US, and the rest of the world will widen over the next few decades.
Britain will be in 11th place by 2050.
Both Indonesia and Nigeria will rise through the world rankings, the latter from 20th to 9th.
E7 economies, China, India, Brazil, Mexico, Russia, Indonesia and Turkey, will, combined, dwarf the G7 economies, Canada, France, Germany, Italy, Japan, the UK and the US, by 2050.
However, Islam will be the fastest-growing religion.
Mainly due to ageing populations and low fertility rates in countries such as Japan and China.
An increasingly large population may result in issues such as food shortages, according to the UN Food and Agriculture Organisation.
The average life expectancy will be 76 by 2050.
In 2010, the world produced around 33 gigatonnes of CO2 - by 2050 its predicted to be 55.87 gigatonnes which could have truly disastrous effects.