Although the importance of sustainability has been presented by many researches, how to implement this concept into practice is still a problem. The sustainability relates with all section of business, but the core capital of business is human capital. Therefore, in my views, leadership influence may play a major role in applying sustainability.
Peter Bakker, president of the World Business Council for Sustainable Development, also argues that business leader should know the positive impact of sustainable and integrate it into operations. He suggests that the way of incorporating sustainability into business is that consider sustainability as risk management. (http://insights.som.yale.edu/insights/how-can-businesses-lead-sustainability)
Additionally, the companies that applying sustainability strategy almost have a leader who emphases the importance of sustainability. Leadership not only influences on making company strategy but also guides the company culture.
Here is an example of IKEA sustainability strategy, which may give some ideas about how to implement sustainability.