However, Sharma et al. (2010: 330) argue that previous research “has been confined to disciplinary silos” or what Srivastava (2007: 68) calls “compartmentalised.” Indeed, Prakash (2002) suggests that organisations can be greener at the firm level, through adding value and using management systems, or at the product level, by designing new products or processes, while paying no attention to the supply chain.