An environmental management system (EMS) provides the business tools you need to plan, manage, implement and maintain the environmental policies of your organization.  

• ISO - Single level of certification. Provides the requirements for an Environmental Management Systems (EMS). The ISO addresses specific environmental aspects including: labeling, performance evaluations, lifecycle analysis and communicating and auditing.
  
  
• Official Environmental Management Systems - U.S. Environmental Protection Agency (EPA).     
  
  
• Integrated Environmental Management Systems Implementation Guide - U.S. EPA step-by-step approach for organizations of any size to develop and implement an Integrated Environmental Management System, following the guidelines of ISO-14001. 
  
  
• Environmental Management Systems (EMS) : An Implementation Guide for Small and Medium-Sized Organizations - U.S. EPA designed for use by EMS implementers, this guide explains EMS concepts and assists in the development of EMS in small and medium sized organizations.
   
  
• Environmental Management System (EMS) Tools : A Reference Guide - U.S. EPA description and usage guidelines of EMS tools.
  
  
• Global Reporting Initiative (GRI) - One of the world's most prevalent standards for sustainability reporting.