EPA subpoenas Halliburton on drilling chemicals

The Environmental Protection Agency has subpoenaed energy giant Halliburton, seeking information on the chemicals used in a controversial drilling technique known as "fracking."
The EPA said Tuesday that it issued the subpoena because Texas-based Halliburton was the only one of nine companies that refused to voluntarily disclose the chemical composition of fluids used in hydraulic fracturing.
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Source: USA Today