Case Study: Valero Energy Corporation Nationwide verification of Greenhouse Gas Emissions Background ERM was retained by Valero Energy Corporation (Valero) to verify greenhouse gas (GHG) emissions and to provide a public assurance statement for inclusion in Valero’s Annual Report, or webpage. The need for third party verification was to meet shareholder expectations. Valero has been tracking GHG emissions since 2003 and has chosen 2003 as the baseline year against which to measure performance. The verification covered reporting year 2005 emissions. ERM’s Approach Utilizing the GHG Protocol Corporate Accounting and Reporting Standard, “The Standard” (The Greenhouse Protocol Revised Edition 2004-World Resources Institute/World Business Council for Sustainable Development), ERM conducted a co

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