I have an electric, but of course gas can be powered by well, gas.
It can be generated by fermentation, and utilizing catalzation with the exhaust the emissions are negligible.
Of course, the other byproducts that may not catalyze into inert substances will be broken down sooner or later, given the efficiency of the gas stove is engineered correctly. This is all speculation. I'm just learning as I go.

It will not hurt to buy a combination unit to be redundant.
When there's good times, we can archieve clean energy if we can all put our minds to it.