Greenhouse emissions from meat/dairy production (the all chain) in highly efficient meat industries of 1st world countries, are negligible when compared to to other sources. [1]

Even when looking at the global numbers and taking into account countries with less efficient systems, the global total is still less than 15% of all greenhouse emissions. [2]

[1] https://ourworldindata.org/co2-and-other-greenhouse-gas-emis...

[2] https://en.m.wikipedia.org/wiki/Environmental_impact_of_meat...