This CFR Backgrounder explains how hydraulic fracturing has enhanced U.S. energy security.
http://www.cfr.org/energy-and-environment/hydraulic-fracturing-fracking/p31559?cid=nlc-dailybrief-daily_news_brief-link9-20131010&sp_mid=43506897&sp_rid=bWljaGVsZXRrZWFybmV5QGdtYWlsLmNvbQS2
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