References
- Harvesting Clean Energy Conference; . 2004 . Van Jamison, POWAIR, January 24,
- Evolution Markets—environmental broker . http://new.evomarkets.com/index.php?page=Renewable_Energy-Green-e_Certifed_Credits
- Chicago Climate Exchange . operates cap and trade system for green house gases http://www.chicagoclimatex.com/content.jsf?id=821
- Green-e - consumer protection for renewable energy and greenhouse gas reduction . http://www.green-e.org/