The document discusses environmental management systems and ISO 14001. It introduces ISO 14001 as the cornerstone standard that specifies requirements for an EMS. The key requirements outlined in Clause 4 are establishing an environmental policy, identifying environmental impacts, setting objectives and targets, implementation through structure and training, monitoring and measurement, corrective actions, audits and management reviews. Integrating an EMS with quality management systems for ISO 9001 registration is also discussed to reduce efforts and costs.