No CO2 comes from livestock farming. Zero. No methane comes from livestock farming. Zero. CO2 and methane from organic sources result from bacterial and fungal decomposition of vegetation. This will happen whether the veggies are left in fields to rot or consumed by animals.Go and read the entire post. I would only add that livestock can prosper in lands that are unsuitable for growing crops, so the standard claim that livestock are using up land that we could more efficiently allocate to crops is far too simplistic.