“Global human population growth amounts to around 75 million annually, or 1.1% per year. The global population has grown from 1 billion in 1800 to 7 billion in 2012. It is expected to keep growing, where estimates have put the total population at 8.4 billion by mid-2030, and 9.6 billion by mid-2050″
Population Reference Bureau. “2013 World Population Factsheet” (PDF). www.pbr.org. Population Reference Bureau. Retrieved 5 December 2014.
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