More data comes out all the time on companies, both large and small, that are making corporate sustainability a cornerstone of their management style. For that reason lots of management teams are beginning to look around and ask themselves, "What would it cost us to do the same? What's the learning curve? What can we expect to get back and how quickly?"  Many individual initiatives will be amenable to a quick ROI calculation but the reality is that most won't. Let's look at both kinds.