Cynthia Walter, from the Sierra Club, and other participants rallied and signed petitions in Schenley Park during a rally against Shale gas drilling in Pittsburgh, Saturday, Sept. 22, 2012. (AP Photo/John Heller)

Associated Press
Cynthia Walter, from the Sierra Club, and other participants rallied and signed petitions in Schenley Park during a rally against Shale gas drilling in Pittsburgh, Saturday, Sept. 22, 2012.   (AP Photo/John Heller)
Cynthia Walter, from the Sierra Club, and other participants rallied and signed petitions in Schenley Park during a rally against Shale gas drilling in Pittsburgh, Saturday, Sept. 22, 2012. (AP Photo/John Heller)
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