In a nutshell, in developed countries, the deforestation happened a long time ago, so it doesn't have a big impact on the continuing CO2 contribution from meat

In a nutshell, in developed countries, the deforestation happened a long time ago, so it doesn't have a big impact on the continuing CO2 contribution from meat production. In other words, no new land is being cleared for livestock in most developed countries. In developing countries, unfortunately, deforestation for livestock production can be a big contribution to CO2.