But it wouldn't produce the exact same thing. Going by the original figures, which were yearly, methane leaks have a harm magnitude of 28 kg/person/year, while the vegan switch would be 1 kg/day, which is 365 kg/person/year, still much more impactful than the savings from sealing leaks.

With that said, the OP's [tgsovlerkhgsel's] general point is still sound, that there is much lower hanging fruit for reducing emissions that would be revealed by a neutral penalty system applied universally, and also show lifestyle changes to be a disproportionately burdensome measure.