The document discusses shale gas production in the United States. It notes that shale gas, extracted through hydraulic fracturing and horizontal drilling, has revitalized the US gas industry and allowed the country to produce 94% of its gas domestically in 2011. While shale gas production is projected to grow significantly over 25 years, there is uncertainty around long-term well productivity since most are less than a year old. Major shale plays include the Barnett Shale in Texas and the Marcellus Shale in the eastern US. Shale gas has important economic and employment benefits but also environmental concerns that require ongoing management.