Doug McKenzie-Mohr, author of Fostering Sustainable Behavior and environmental psychologist has a great website to look up articles and cases studies that relate to fostering sustainable behavior. His focus is more on communities and public at large social marketing techniques but the resources and information can be applied to business too. 
He has five main topic areas of agriculture and conservation, energy, transportation, waste and pollution and water. Anyone can sign up for an account, just click on Account to sign up and you can access the discussion forums.
His book, Fostering Sustainable Behavior, is also available online to read. It is a comprehensive book on how to identify the behaviors a community wants to change and build a strategy around changing those behaviors.
Tools of Change is another site that offers community-based social marketing resources. This site also has case studies as well as planning guides to help communities begin planning environmental strategies. Their topics include environmental, health and nutrition and safety.