The Energy Policy Act of 2005 excluded hydraulic fracturing from both the Clean Air and Clean Water acts. https://en.wikipedia.org/wiki/Exemptions_for_hydraulic_fract...
If it's as safe as we're led to believe, why does it need to be exempted from the laws that protect the environment we all share?
As it is a very potent greenhouse gas, the effects could be significant.
To be clear, both are bad and I hope renewables eat their lunch, breakfast, and dinner in short order.