The UN has decided to announce that on October 31, 2011 the Earth’s human population will pass the seven billion mark, up from the six billion that was designated on December 5, 1998. The United Nations Population Division Agency is the main organization that estimates global population. Every two years, their report attempts to piece together surprisingly fragmentary national census data and demographic surveys to arrive at a global estimate. As a geographer, I have long been interested in these reports, and in all aspects of population change and distribution on the earth.
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