This report summarises information on exploration & production (e&p) activities carried out by contributing OGP member companies in 2009. 35 member companies, working in 66 countries worldwide, have submitted data for the report. This total includes 3 companies reporting for the first time this year, in addition to the 32 companies that contributed data in 2008. Information is aggregated at both global and regional levels and is expressed within 6 environmental indicator categories: Gaseous emissions; Energy consumption; Flaring; Aqueous discharges; Discharges of non-aqueous drilling fluids on cuttings; and Spills of oil and chemicals. These data represent oil and gas wellhead production of 2,352 million tonnes (about 36% of global production sales in the BP Energy Review 2009). However, regional coverage is uneven, ranging from almost all known production in Europe to 10% in the Former Soviet Union.