We only start to understand the gargantuan volumes of methane that are being released naturally into the atmosphere every day. Methane is a gas that is being produced in vast quantities abiotically between the Earth’s crust and mantle. It rises to the surface and is released into the atmosphere. As its lighter than air it rises and dissipates and the atmosphere oxidizes it quickly which is why we don’t find a lot of it in the air. Actually. methane concentrations are microscopic. The tiny contribution that animals make is irrelevant to any climate in the equally irrelevant methane picture.
Researchers found that the removal of dairy cows from the United States agricultural industry would only reduce greenhouse emissions by about 0.7 percent while significantly lowering the available supply of essential nutrients for humans