ISO 14001 is the internationally recognized standard for Environmental Management Systems (EMS). It provides a comprehensive framework and specific requirements for an organization to establish, implement, maintain, and continually improve its EMS. Following this standard helps an organization manage its environmental responsibilities in a systematic manner that contributes to the environmental pillar of sustainability. It is designed to be applicable to any organization, regardless of size, type, and nature, and is the definitive standard for setting up a formal EMS framework.

A. The EU Code of Conduct (EU-COC) is a set of voluntary best practices for energy efficiency, not a formal management system standard.

B. ISO 50001 is a standard for Energy Management Systems (EnMS), focusing specifically on energy performance, which is a subset of a broader EMS.

C. LEED is a green building certification system focused on the design, construction, and operation of buildings, not an organizational management system.

1. International Organization for Standardization. (2015). ISO 14001:2015 Environmental management systems — Requirements with guidance for use. ISO. Geneva, Switzerland. The standard's introduction explicitly states its purpose is to provide a framework for managing environmental responsibilities.

2. United States Environmental Protection Agency (EPA). "Environmental Management Systems (EMS)." The EPA website identifies ISO 14001 as the most common framework for an EMS.