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I believe it's 51% of the greenhouse effect, that include 20ish percent of co2 emission resulting from cattle + the effect of methane which is a much more powerfull green house gas than co2.

(now whether this number is 51% or something else is another debate)

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51% includes also respiration of cows, which should be net zero, because it is exactly the CO₂ that was captured by the plants before. (which is not okay to do)

Also 51% because equivalent calculations are not done over the span of 100 years, but shorter (methane becomes more dominant) and deforestation is also accounted for - (which is both fine).

So it is somewhere in between the results of renovated studies that say it is around 31% (e.g. Tukker et al) and the 51% worldwatch report.

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