by 
Perryman
ANSWERS: 5
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1.9 Billion
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1.5 billion
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Between 1.55 and 1.76 billion http://www.census.gov/ipc/www/worldhis.html
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1.6 billion http://geography.about.com/od/obtainpopulationdata/a/worldpopulation.htm
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Remember the statistics are not head counts, they are estimates. Actually, I cannot remember the stat but I recall seeing it used in Al Gore's recent movie "Inconvenient Truth." I do remember when I was in Jr. High in the late 1950's we talked about what the world would be like when it had three billion people, it got there in 1959. We also talked about environmental hazards and zero population growth (I went to a parochial school). Check out the US Census estimates at: http://www.census.gov/ipc/www/worldhis.html.
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