"Hydraulic fracturing, an increasingly common method of extracting natural gas that involves shooting a concoction of water, sand and chemicals deep underground, has sparked controversy around the country — not least because drillers mostly keep their chemical formulas secret. But Texas, the leading gas-producing state, could help change industry practices by requiring public disclosure of the chemicals used."

Kate Galbraith reports for the Texas Tribune March 25, 2011. [2]