The world produces and transports anhydrous ammonia in the millions of tons annually. There is plenty of experience with it. Its hazards are well known and well compensated for.
The world also uses a lot more natural gas and despite uses less precautions.
I work at John Deere, there are a lot of product ideas that never made it to the drawing board because someone came up with an accident scenario involving NH3. The stuff is not to be taken lightly. People who refuse to wear seat belts or motorcycle helmets wear full protective gear when around it.
CH4 is environmentally unfriendly, but you don't need nearly as much safety gear to work with it.