Sorting Through the Claims, Counterclaims About Environmental Impact of 'Fracking'
Threat to Food Chain?
No evidence exists that fracking chemicals have made their way into the food chain, though Cornell University researchers reported last yearin a peer-reviewed study that cattle grazing near fracking operations appeared to suffer health impacts. Pro-industry groups call the study "fatally flawed."
Bill Dedman is an investigative reporter for NBC News; he reported from Pennsylvania.
Karen Weintraub is a freelance health and science reporter in Boston.