Warning: 'Fracking' rock to extract gas causes earthquakes. But how big?

Daily Kos - Scientists aren't willing yet to say if there is a connection between a series of nine small earthquakes near Youngstown, Ohio, and hydraulic fracturing. That's the technique nicknamed "fracking," which injects millions of gallons of water under pressure to break up rock and get at fossil fuels, especially natural gas.  Read more.


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