Industry has recognized that with the emergence of mandatory reporting programs and economic instruments that rely on precise knowledge of GHG emissions (and emission reductions) there is a growing focus on improving the quality of emission estimations. To meet this need, industry developed guidance entitled: “Addressing Uncertainty in Oil & Gas Industry GHG Inventories: Technical Considerations and Calculation Methods”. This is a collaborative effort among API, it’s global affiliate IPIECA, and it’s European counterpart CONCAWE. Addressing uncertainty for GHG emission estimates complements the API GHG Methodology Compendium (API Compendium)released in August 2009. It is being released as a ‘Pilot-Test’ version for one-year, to be followed by an updated version in 2010. The document provides the needed background information and details on measurement uncertainty and statistical calculation methods that are relevant for the industry, but could be used by other sectors as part of their GHG inventory development. You are invited to visit this link to download the document: