World Population Forecast to Top 7 Billion in 2011 - NYTimes.com

World Population Forecast to Top 7 Billion in 2011 - NYTimes.com: "Projections, especially over decades, are vulnerable to changes in immigration, retirement ages, birthrates, health care and other variables, but in releasing the bureau’s 2010 population data sheet, Carl Haub, its senior demographer, estimated this week that by 2050 the planet will be home to more than nine billion people."