Brown releases proposed rules for fracking

The Brown administration has released much-anticipated proposed rules for fracking, a controversial technique for drilling for oil and natural gas reviled by environmentalists.

The process, formally known as hydraulic fracturing, involves pumping water, sand and a mixture of chemicals into geological strata to free trapped hydrocarbons.

Supporters say that it is opening up a vast new energy source and creating high-paying jobs. Opponents contend that fracking could pollute underground drinking water supplies and cause health hazards.

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