How to Persuade CEOs to Pursue a Sustainable Route

When you're talking to CEOs, and if I remember correctly, you try to speak to two or three a day. So which arguments are most persuasive for them? Is it basically do these things? You will save money as we cut down on packaging... Or something else? What's the most effective argument to make to persuade these guys to pursue a sustainable route? Well, I find that thinking again about performance and health in an organization is very important.