WYO FRACKING

An oil well pump jack runs on the plains near Douglas, Wyo., Thursday, November 22, 2013. The state will require pre-drilling testing of groundwater at sites where hydraulic fracturing, also known as "fracking" is used. (Kevin Moloney for the New York Times)

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$An oil well pump jack runs on the plains near Douglas, Wyo., Thursday, November 22, 2013. The state will require pre-drilling testing of groundwater at sites where hydraulic fracturing, also known as "fracking" is used. (Kevin Moloney for the New York Times)$