There was a study done a few years ago that MBA students were less ethical than other students. Since then all MBA programmes have done a lot to get case studies on ethical dilemmas in every subject. Also on offer are courses on sustainable development.
Katie Kross has just written a book called "Profession and purpose: a resource guide for MBA careers in sustainability". apparently it is "the sustaibility coach MBA's have been waiting for". Well I don't know about that, but it is a resorce for people interested in careers in this area.