Amanda's comment gets at a very important point - that there's plenty of room for moderation here without going all the way. We don't ask people to completely give up petroleum even if we do look for reductions (walking, biking, public transportation, more efficient cars); we can do a lot more to encourage people to eat a more plant-based diet even if they're not going veg.
The meat you eat also takes a lot longer to mature (cattle on grass grow more slowly than on grain), meaning all that extra time emitting methane adds up to more GHG impact per unit of final product than feedlot. Also, well managed pasture might hold good amounts of carbon, but not as much as forest when you count what is above ground too. Grass-fed is nice, probably better for us and the animals, but it is not a large-scale solution to the problem. Ultimately we still need to cut back in a big way.
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