defra：2011年商品和服务在生命周期内的温室气体排放评价规范报告（英文版）

This Publicly Available Specification (PAS) specifiesrequirements for the assessment of the life cycle GHGemissions of goods and services (collectively referredto as "products") based on key life cycle assessmenttechniques and principles. This PAS is applicable toorganizations assessing the GHG emissions of productsacross their life cycle, and to organizations assessing thecradle-to-gate GHG emissions of products.Requirements are specified for identifying the systemboundary, the sou