It’s considered the home of the oil and gas industry, so it’s of special significance that Texas Governor Rick Perry has signed a law requiring drillers to disclose the chemicals in their so-called “fracking” fluids.

Hydraulic fracturing has led to a new energy boom in America. Hundreds of trillions of cubic feet of natural gas locked up in shale in Texas, Louisiana, Pennsylvania and other states is now being tapped.

Ten years ago, it looked like the U.S. was running out of natural gas and would have to increase imports. Now there is so much of it that terminals built to accept gas from overseas are being converted to export it.

But the fracturing process has been fraught with controversy.

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