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        September 28, 2012 -
        
  
        The U.S. Geological Survey verifies earlier EPA findings that fracking for natural gas contaminated groundwater in rural Wyoming.
  
      
     
   
  
  
    
        
    
          
              
            
            
            
        July 5, 2012 -
        
  
        Fracking proponents traveled to Pennsylvania last year to visit natural gas drilling sites. Their tour guide was Chesapeake Energy -- a company that's now under federal investigation for questionable business practices and price fixing.