Externalities of burning gas are generally not included in its price, especially in the US. Even EU with is much higher gas taxes doesn’t really come close to equalising its costs to the society. So if a government decides it’s prudent to put the burden of externalities on people burning the gas - its price would rise several times over in US and double or more in EU.

Starting in 2027 road transport and home heating will be carbon taxed in the EU (ETSII).