Useful Links
Eyes on Earth (NASA Earth Observation portal)
The End of Suburbia (Peak Oil Site)
An Inconvenient Truth
E. F. Schumacher Society (the teachings of the author of Small is Beautiful live on at this site)
Society for a Dark Sky
Columbia University's Earth Island Institute
World Health Organization
Biosphere II
U.S. Clean Air Agencies
EPA Greenhouse Gas Emissions Tool (based on Toxics Release Inventory data)
ESA Earth Observation Satellite