Energy Intensity (Mcal/TCS) (4) GHG Inventory and Reduction GHG inventory: CSC complied with the GHG Inventory and Registration Guideline of the Environmental Protection Administration (EPA), Executive Yuan, ISO 14064, the international standard specification on greenhouse gas emissions, and guideline documents enacted by international organizations such as IPCC, worldsteel, and WBCSD to produce its professional GHG inventory system.