Contact the Customer Relations or Investor Relations Department of that company and they will be happy to provide you with all sorts of information.
Any public company’s annual report will have information about their green projects. Some would be BP (the oil company), S. C. Johnson Co., and others like Clorox (new line of “green” cleaners”. Try googling “Environmental Annual Report” and see if companies come up.
Procter and Gamble or WalMart. Both are really into this and info should be available on their websites.