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In page World population:
"According to the World Health Organization, the global average life expectancy is 71.4 years as of 2015, with women living an average of 74 years and men approximately 69 years.[1] In 2010, the global fertility rate was estimated at 2.52 children per woman.[6] In June 2012, British researchers calculated the total weight of Earth's human population as approximately 287 million tonnes, with the average person weighing around 62 kilograms (137 lb).[7]
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