1. The Earth Policy Institute.
2. Trading Charts.
3. Sightline Institute.
4. Walk Score.
5. "Food and fuel for all: realistic or foolish?".
6. Biiofuels, Bioproducts, and Biorefining.
7. Businessweek article on green companies.
8. Grokker.
9. "Groxis and Yahoo! Team Up to Grok the Web".