Hydraulic fracturing or "fracking" is generally associated with natural gas. But in California, it's mostly used to extract oil. The practice is highly controversial -- three counties in the state have voted to ban it. Now, an independent scientific panel says it's not possible to know whether California has rich deposits of oil in its shale formations. A state law required the panel to study the impact of fracking in the state.
Fracking Study: More Data Needed to Determine Potential in California
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