- 3M
- Accenture
- AES Corporation
- AIG
- Air Products and Chemicals, Inc.
- Alcoa
- American Electric Power
- Boeing
- Caterpillar
- CH2M HILL
- Chevron Corporation
- ConocoPhillips
- Cooper Tire & Rubber Company
- Deloitte Touche Tohmatsu
- Dow Chemical
- Duke Energy
- DuPont
- Entergy Corporation
- Exelon
- Ford Motor Company
- General Electric
- General Motors
- Greif
- IBM
- Interface
- International Paper
- ITT Industries
- Johnson Controls
- Johnson & Johnson
- Kimberly-Clark Corporation
- MeadWestvaco
- Newmont Mining
- Oracle
- PepsiCo
- PricewaterhouseCoopers
- Procter & Gamble
- Rohm and Haas Company
- S.C. Johnson & Son
- Smurfit-Stone
- SunGard
- The Boston Consulting Group
- The Coca-Cola Company
- The Goodyear Tire & Rubber Company
- The New York Times Co.
- Time Warner
- United Technologies Corporation
- Weyerhaeuser