As home to supermajors, as well as a plethora of smaller, independent energy players, the US boasts one of the largest concentrations of energy personnel in the world. With its insatiable appetite for energy resources, the United States is the world's single largest consumer of oil, using as much as 20.73 million barrels per day as of 2008. Recently, interest has peaked in the vast quantity of untapped natural gas resources in the US, the reserves of which were inventoried in 2008 at 238 Tcf, with producers specifically targeting the nation's promising shale formations for this energy commodity.
Supply chain management encompasses demand and supply planning, suppliers, inventory, warehouse and logistics management. It covers all processes related to raw materials and associated information from sourcing to end users. There are various certification exams developed for supply chain professionals, namely APIC's certification (Certified Supply Chain Professional or CSCP), ISCEA'S certification (Certified Supply Chain Manager or CSCM), and the CISCM certificate (Chartered Supply Chain Management Professional or CSCMP).