It isn't as easy a comparison as it should be. Besides the water misuse of hydraulic fracturing, the methane leakage of gas extraction and distribution can exceed the greenhouse gas impact of coal use.
"One recent study found that methane losses must be kept below 3.2 percent for natural gas power plants to have lower life cycle emissions than new coal plants over short time frames of 20 years or fewer."
"[Methane] is 34 times stronger than CO2 at trapping heat over a 100-year period and 86 times stronger over 20 years."
https://www.ucsusa.org/resources/enviro ... atural-gas
The methane leaking from the Permian Basin O&G fields in TX and NM may exceed the greenhouse gas impact of using coal.
"When these sort of emission rates are considered, methane makes the greenhouse gas footprint of natural gas far worse than even that of coal."
https://news.bloomberglaw.com/environme ... lion-homes