Many personal values should influence your behaviour as a marketing manager. This means, first, not to promote products that you consider harmful. For example, given that American adults are decreasing their consumption of cigarettes, an unscrupulous person might market cigarettes to children in both the United States and the developing world to maintain profits. An ethical manager might refuse to do this.
If you have strong beliefs that we should pass on as good a world as possible to our descendants, you might mandate green policies such as focusing market campaigns on new media and not destroying forests by sending out junk mail.