Can certification reduce carbon emissions? That is the main issue of our study. It is now recognized that decarbonization is the ultimate challenge of any business, and all sectors are confused, especially since it has been proven that carbon emissions from industrial fabric play a crucial role in climate change and global warming. However, the question of how remains complex and varied depending on the technological, economic, and environmental context of each company and sector of activity without forgetting the issue of cost, which remains a determining factor in choosing decarbonization strategies. In this context, this article aims to study the influence or relationship between adopting voluntary environmental approaches such as ISO 14001 and environmental performance. Through the analysis of the case studies, we want to shed light on this controversial issue in the literature and highlight the relationship between ISO 14001 and achieving the goal of decarbonization.