Human digestion doesn't produce nearly the amount of methane as cattle. Our digestive processes don't rely so heavily on fermentation. Of course, if we stopped

Human digestion doesn't produce nearly the amount of methane as cattle. Our digestive processes don't rely so heavily on fermentation. Of course, if we stopped eating meat, our digestive processes over time would evolve to include more fermentation, so... Hard to say. But, now, humans aren't ruminants, and so produce climatically insignificant amounts of methane. Livestock doesn't even account for the majority of methane production anyway; landfills, fossil fuel production, and burning of biomass produce even more. That said, we do need to reduce our dependence on ruminants as a food source. Methane production aside, a significant amount of deforestation occurs to make grazing land for cattle. Add in carbon/methane emissions during transportation of livestock products, environmental effects of the deforestation... Cattle have a fairly large carbon "hoofprint". (I use carbon footprint, or humorous derivation thereof, to include methane, which does after all include carbon)