At the end of the day, people will follow you or people will be energised by you if they buy into your vision or purpose. So the most important thing is to be true to yourself. That's why I would say to be a great leader - you, first and foremost, have to be a great human being. And sharing that purpose and sharing the values.
More and more businesses are seeing the potential of a more sustainable business model, driven both by the firm belief that business can be a force for good and by the realization that the cost of inaction often exceeds the cost of action - notably when it comes to the growing threat of climate change and water scarcity.