“…For example, in their literature review on the outcomes of ISO 14001, Boiral et al (2018) found that 80.9% of the works studied used perceptual measures, whereas only 13.8% used data on environmental impact. Therefore, doubts about the real, substantive, or relevant impact of certifiable EMSs to improve the environmental greening or performance of the certified organizations, and the need to gather more different types of evidence, can be understood, especially in the case of the EMAS scheme (Heras‐Saizarbitoria, Boiral, Allur, et al, 2020; Heras‐Saizarbitoria, Boiral, García, et al, 2020; Testa et al, 2014; Testa, Iraldo, & Daddi, 2018).…”