Websites
http://www.envirolink.org/ This website provides access to thousands of online environmental resources including general information, organizations, news articles, job opportunities, and much more.
http://www.world.org/weo/top1000 this site has a list of "the top 1000 most useful environment related web sites". See for yourself.
This wikipedia article lists a whole ton of environmental organizations, organized by region of the world.
http://www.eco.org/ Founded in 1972, The Environmental Careers Organization (ECO) is a national, non-profit organization that develops professionals for the environmental field through paid environmental internships that provide highly professional, on-the-job learning experiences for bachelor's, master’s, and doctoral students and recent graduates.
http://www.interenvironment.org/wd/ This descriptive directory has over 350 Web pages with thousands of entries and links. It has detailed subject and geographic sections, background pages, and numerous cross-references.
http://eelink.net/eeorganizationsandprojects-general.html EE-Link, Environmental Education on the Internet, is a resource designed to support "students, teachers and professionals that support K-12 environmental education, such as media specialists, inservice providers, nature center staff and curriculum developers." The site contains Internet environmental based school projects, classroom activities including many lesson plans, environmental facts and data from many sources, curriculum directory guides, organization and audio visual catalogs, software, conference and workshop announcements, higher education links, facts, grants, literature pointers, regional information, and pointers to other environmental sites.