http://www.un.org/popin/
The UN Population Information Network, which contains world population estimates and projections by the UN, historical population levels, etc.
http://www.npg.org
The Negative Population Growth homepage, which contains world population facts, U.S. population facts, U.S. state population statistics, and
U.S. and world population clocks.
http://popplanet.org/popplanet
The Population and Environment Linkages Service contains abstracts and links to 14,259 sources including books, reports, journal articles,
newspaper articles, news analysis and much more.
http://www.unaids.org/en/default.asp The joint United Nations programme on HIV/Aids (UNAIDS), the main advocate for global action on HIV/Aids, Web page that includes facts about HIV/Aids, access to reports and information by keyword and/or region and news highlights.
