Some of the reasons it is important for a business to be aware of its environmental impact and manage sustainability:

• Reduce waste
• Add value to clients and suppliers
• Improve the bottom line
• Develop systems that  use resources effectively and efficiently
• Effectively manage company brand and positioning
• Be a good citizen
• Contribute to the environmental awareness of its communities and workforce
• Reduce carbon emissions

 It seems to me that sustainability is about being mindfully aware of our impact on others and the planet and taking positive action now.

 Good business sense really.