The area needed for that kind of farming is prohibitively large if we want to sustain current levels of consumption, though. Those bison the parent poster talks about moved over a pretty darn huge area: https://en.m.wikipedia.org/wiki/Great_bison_belt
I has also been shown that under the right conditions grazing lands can actually sequester carbon [1].
So there is no a priori argument against meat from the point of view of climate effects, though there are obviously better and worse practices.
[1] http://www.fao.org/3/i1880e/i1880e00.htm