1 2 "2004 UN Population Projections, 2004" (PDF). ↑ Data source: http://faostat3.fao.org/download/Q/QI/E, see graph metadata for further details. ↑ "Historical Estimates of World Population, U.S. Bureau of the Census, 2006". Archived from the original on 2013-10-13. ↑ "International Data Base". ↑ Simon, Julian L, "More People, Greater Wealth, More Resources, Healthier Environment", Economic Affairs: J. Inst.