Normally I wouldn't post a book about conflict and change management but these authors have an interesting spin on why it can be hard to change, even when we want to (as in their concept of 'competing commitments' where you want two things--perhaps subconsciously--that seem mutually exclusive, so you don't change.) It seemed these are useful concepts for sustainability to diagnose personal and organizational 'immune responses.'
Kegan, R., & Lahey, L. L. (2001). How the way we talk can change the way we work: seven languages for transformation. San Francisco: Jossey-Bass. ISBN-13: 978-0787963781
Other publications by the authors:
Immunity to Change: How to Overcome It and Unlock the Potential in Yourself and Your Organization (Leadership for the Common Good).