Environmental News Network
http://www.enn.com/

POPLINE (Johns Hopkins University Center For Communication)
http://www.jhuccp.org/
Popline provides authoritative, accurate, and up-to-date reproductive health information in electronic formats for developing-country health professionals and policy-makers.

POPULATION INDEX (Princeton University, Office of Population Research)
http://popindex.princeton.edu/
Population Index is the primary reference tool to the world's population literature. It presents an annotated bibliography of recently published books, journal articles, working papers, and other materials on population topics.

MEDLINE (The National Library of Medicine, U.S.A.)
http://www.nlm.nih.gov/
PubMed, a service of the National Library of Medicine, provides access to over 11 million MEDLINE citations back to the mid-1960's and additional life science journals. PubMed includes links to many sites providing full text articles and other related resources.

PRB (Population Reference Bureau)
http://www.prb.org/
PopNet is a resource for population information. PopNet presents information on population topics such as Demographic Statistics, Economics, Education, Environment, Gender, Policy and Reproductive Health.

UNFPA (The United Nations Population Fund)
http://www.unfpa.org/
The UNFPA helps developing countries find solutions to their population problems. About a quarter of all population assistance from donor nations to developing countries is channeled through UNFPA. This site provides comprehensive, up-to-date articles on the state of world population.

UNDP (The United Nations Development Program)
http://www.undp.org/
The UNDP helps developing countries attract and use aid effectively and promotes South-South cooperation. It seeks to address the many causes of poverty and promotes development, including through the protection of human rights and the empowerment of women. This site allows access to the Human Development Report and other reports and graphs regarding development that are not available elsewhere.

UNICEF (The United Nations Children Fund)
http://www.unicef.org/
UNICEF, an integral part of the United Nations system, has its own governing body, an Executive Board that sets policies, reviews programs and approves budgets. UNICEF is mandated by the United Nations General Assembly to advocate for the protection of children's rights, to help meet their basic needs and to expand their opportunities to reach their full potential. This website offers various publications and ways of interacting with and supporting children worldwide.

UNAIDS
http://www.unaids.org/
As the main advocate for global action on HIV/AIDS, UNAIDS leads, strengthens and supports an expanded response aimed at preventing the transmission of HIV, providing care and support, reducing the vulnerability of individuals and communities to HIV/AIDS, and alleviating the impact of the epidemic.

WHO (The World Health Organization)
http://www.who.org/
The WHO website presents updated articles on world health issues including statistics and other data regarding world population health.

WORLD RESOURCES (World Resources Institute, U.S.A.)
http://population.wri.org/publications.cfm
World Resources is an authoritative primary reference volume on global environmental and  natural resource conditions and trends for the United Nations, World Bank, and related international organizations. It is widely used by scientists, students, and non-governmental organizations.