ISO 14001, EMAS and environmental performance: A meta‐analysis

The adoption of voluntary environmental certifications such as ISO 14001 and Eco‐Management and Audit Scheme (EMAS) has gained momentum in the last two decades. The scholarly literature has analyzed in depth the performance implications of the adoption of these certificates. Yet the findings are scattered and inconclusive. This article aims to shed light on this issue by meta‐analyzing the influence of the adoption of voluntary environmental certifications on corporate environmental performance, drawing on a sample of 53 scholarly studies analyzing a total of 182,926 companies. The findings show a positive influence of ISO 14001 and EMAS certifications on corporate environmental performance. A set of underlying moderating effects are also identified, such as a more pronounced positive effect for adoptions based on environmental innovation and for firms with a more mature certification. Implications for scholars, managers, and other stakeholders are discussed.