“…External demand Extent to which customers demand environmental improvement of their suppliers or demand products/services with reduced negative environmental impact, and are willing to pay for this (Collins et al, 2007;Drake et al, 2004;Mir and Feitelson, 2007;Revell and Blackburn, 2007;Simpson et al, 2004). This in turn influences the perception by SME owner-managers of potential image enhancement (Borga et al, 2008;Collins et al, 2007;Pimenova and van der Vorst, 2004;Studer et al, 2006), competitive advantage (Borga et al, 2008;Clement and Hansen, 2003;Drake et al, 2004;Pimenova and van der Vorst, 2004;Revell and Blackburn, 2007;Studer et al, 2006) and new business opportunities (Simpson et al, 2004) from environmental improvement. SME environmental knowledge Extent to which SME owner-managers or employees have knowledge about how to engage in environmental improvement and the time to acquire this knowledge (Bradford and Fraser, 2008;Collins et al, 2007;Hoevenagel and Wolters, 2000;Masurel, 2007;Pimenova and van der Vorst, 2004;Roy and Therin, 2008;Tilley, 1999).…”