Everyone! Sustainability should come top down, but can also be driven bottom up by all employees. Whoever is driving change, it doesn’t matter. Of course, if the motivation for becoming more sustainable is coming from the CEO or founder of a business, change may come faster and hit less roadblocks. But, change can also come through one or more ‘sustainability champions’ within a company. As long as someone is asking the tough (but important) questions, that’s better than no-one. The best thing management can do is to empower those voices, act on their ideas and encourage others do to the same.  The larger the company, the more likely it is to have a Sustainability Department or Division and have someone in management responsible for driving environmental initiatives. This is becoming increasingly common as corporate realise the importance of sustainability to all aspects of their business.