FILE - In this Jan. 19, 2012 file photo, Sundance Institute president and founder Robert Redford speaks during a press conference at the 2012 Sundance Film Festival in Park City, Utah. Redford is among the 100 celebrities leading “Artists Against Fracking.” Hydraulic fracturing, a new practice colloquially known as fracking that involves injecting water into underground rock to free vast reserves of gas, has been linked to documented cases of leaking gas ruining nearby well water, of air pollution, and of problems from the waste the drilling generates. (AP Photo/Danny Moloshok, File)

Associated Press
FILE - In this Jan. 19, 2012 file photo, Sundance Institute president and founder Robert Redford speaks during a press conference at the 2012 Sundance Film Festival in Park City, Utah. Redford is among the 100 celebrities leading “Artists Against Fracking.”  Hydraulic fracturing, a new practice colloquially known as fracking that involves injecting water into underground rock to free vast reserves of gas, has been linked to documented cases of leaking gas ruining nearby well water, of air pollution, and of problems from the waste the drilling generates. (AP Photo/Danny Moloshok, File)
FILE - In this Jan. 19, 2012 file photo, Sundance Institute president and founder Robert Redford speaks during a press conference at the 2012 Sundance Film Festival in Park City, Utah. Redford is among the 100 celebrities leading “Artists Against Fracking.” Hydraulic fracturing, a new practice colloquially known as fracking that involves injecting water into underground rock to free vast reserves of gas, has been linked to documented cases of leaking gas ruining nearby well water, of air pollution, and of problems from the waste the drilling generates. (AP Photo/Danny Moloshok, File)
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