Voluntary international standard for the measurement, management and reporting of greenhouse gas emissions. Created by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), the GHG Protocol is one of the most widely used standards globally to help organizations measure and reduce their environmental impact. The protocol classifies the direct and indirect emissions produced by the organization (Scope 1, Scope 2 and Scope 3), announces the quantification methods and provides the criteria for defining corporate boundaries.