Methane from organic sources is at a steady state since it oxidizes to CO2 over time. In effect, that means that keeping the same number overall of heads of cattle does not increase global warming dues to methane or CO2 since the methane they produce was fixed from atmospheric CO2. There may be global warming caused by CO2 emissions from cattle farming due to fossil fuel use, particularly feed production, but that's a function of the way that farming is done, not cattle itself. Grass-fed cattle on marginal land that's not otherwise suitable for other food production is not the same thing as industrial cattle farms fed from corn.
It would be if we didn’t have a billion cattle on the planet and climbing. There’s a cow out there for every 7 people or so and if we make more people they’ll make more cows.
Cow methane is on the order of human population, so it matters.
