Governments, Agencies and NGOs
U.S. Environmental Protection Agency
A government site packed with useful features, from graphical air quality meters to updated lists of potentially dangerous consumer items.
United Nations Environmental Programme
Maps, graphics, videos, charts -- this site is full of useful multimedia elements to help explain global challenges like climate change, biodiversity, disappearing world cultures, even art.
United Nations: Division for Sustainable Development
A treasure trove for sustainability researchers -- white papers, policies and an A-to-Z guide to topics ranging from agriculture to toxic chemicals to the crisis facing the world's fresh water supply.
The Nature Conservancy
One of the most globally influential non-governmental agencies focused on sustainablity of the Earth's natural resources. Details of the group's activism on all continents, plus fact sheets and multimedia covering seemingly every threatened habitat.
Union of Concerned Scientists
Online experts covering a range of topics including food safety, clean energy technologies and global warming. Site features green-living tips, reviews on "clean" autos and building techniques and much more.
World Wildlife Fund
Now featuring a Second Life virtual home. One of the most respected NOGs in the world, the WWF focuses on protecting endangered or threatened species by preserving their natural habits.
Energy Star
A wealth of tools and tips from the federal government on how to make homes more energy efficient. Site features tools and printable, downloadable guides for everything from finding energy-smart appliances to building upgrade calculators.
HUD E-Maps
Worried about potential pollution in your neighborhood? This Housing and Urban Development site shows the locations of hazardous-waste generators and handlers plus sources of air pollution and other toxins across the U.S. The site also generates maps for population, ethnicity, income and other factors.