similarly, most natural gas is used for power generation and industrial processes. in the US, only ~15% is used residentially, and most of that is for home heating, water heating, and clothes drying. about 1/3 of our national energy use is derived from natural gas, so you're on the order of 1% (or less) of national energy being consumed by natural gas cooking. it's a tiny problem in the energy pollution mix.
we'd be much better served in this regard by focusing all our efforts on reducing carbon pollution from electricity production and transportation, which accounts for well over half of the problem, not a tiny slice like gas cooking because it's a "small sacrifice".