Sustainability has been defined as “the process of living within the limits of available physical, natural, and social resources in ways that allow the living systems in which humans are embedded to thrive in perpetuity” (Sustain SU, 2010). Hence, in terms of environmental sustainability, there needs to be a focus on the use of renewable rather than non-renewable resources. And even with renewable resources, there needs to be a focus on avoiding over-utilisation and wastage. Sustainability is about more than just ‘being green’. It is about doing things efficiently and effectively, being innovative and creating a positive impact, achieving excellence, and leaving lasting legacies.