A man signs a petition during a global Frackdown Day calling for a moratorium on Shale Gas Drilling at Schenley Park in Pittsburgh, Saturday, Sept. 22, 2012. (AP Photo/John Heller)

 

              A man signs a petition during a global Frackdown Day calling for a moratorium on Shale Gas Drilling at Schenley Park in Pittsburgh, Saturday, Sept. 22, 2012.  (AP Photo/John Heller)
A man signs a petition during a global Frackdown Day calling for a moratorium on Shale Gas Drilling at Schenley Park in Pittsburgh, Saturday, Sept. 22, 2012. (AP Photo/John Heller)