Gas Drilling Attack Ads

  These are billboards along the Pennsylvania Turnpike in New Stanton, Pa., that attack critics of natural gas on Tuesday, Sept. 11, 2012. The website describes critics of gas drilling as "green slime." (AP Photo/Gene J. Puskar)
These are billboards along the Pennsylvania Turnpike in New Stanton, Pa., that attack critics of natural gas on Tuesday, Sept. 11, 2012. The website describes critics of gas drilling as "green slime." (AP Photo/Gene J. Puskar)

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