What is the GHG protocol ? 

The Greenhouse Gas Protocol is an initiative that serves to determine a universal standardized measurement by which companies and organizations can be evaluated on their output of emissions. 

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The GHG protocol is the most widely used standard of emissions accounting in the world. 

The protocol is partnered with various organizations around the world such as: 

• The World Resource Institute, 
• The World Business Council for Sustainable Development, 
• United Nations foundation
• Other various governments and NGOs throughout the world

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Through these partnerships, they produce the Corporate Accounting and Reporting Standard, which provides the basis for virtually every official GHG measuring service globally. In addition to providing the measurement standards, the GHG protocol also offers reporting standards, sector guidance and training tools for businesses and governments to reduce their emissions. 

Check out their website for more information.