File- In this Aug. 29, 2012 file photo provided by Starpix, actor Mark Ruffalo speaks at a New York news conference to announce the formation of “Artists Against Fracking,” a coalition of artists opposing hydraulic fracturing. 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/Starpix, Andrew Toth, File)

Associated Press
File- In this Aug. 29, 2012 file photo provided by Starpix, actor Mark Ruffalo speaks at a New York news conference to announce the formation of “Artists Against Fracking,” a coalition of artists opposing hydraulic fracturing. 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/Starpix, Andrew Toth, File)
File- In this Aug. 29, 2012 file photo provided by Starpix, actor Mark Ruffalo speaks at a New York news conference to announce the formation of “Artists Against Fracking,” a coalition of artists opposing hydraulic fracturing. 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/Starpix, Andrew Toth, File)
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