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The fracking controversy

Associated Press
This undated handout frame grab taken from video, provided by the Pennsylvania Department of Environmental Protection shows bubbling due to impaired cementing in an unconventional gas well in Pennsylvania, In Pennsylvania’s fracking boom, new and more unconventional wells leaked far more than older and traditional wells, according to a study of inspections of more than 41,000 wells drilled. And that means that that methane leaks could be a problem for drilling across the nation, said the author of the study, which funded in part by environmental activist groups and criticized by the energy industry. The study was published Monday by the Proceedings of the National Academy of Sciences. (AP Photo/Pennsylvania Department of Environmental Protection)

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The U.S. Geological Survey has recorded seven small earthquakes shaking central Oklahoma in a span of about 14 hours.

The temblors are part of an increase in earthquakes across Oklahoma, Texas and Kansas that some scientists say could be connected to the oil and gas drilling method known as hydraulic fracturing, and especially the wells in which the industry disposes of its wastewater. (AP)

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