Good question! Surprisingly, very little: Livestock make up 62% of the world’s mammal biomass; humans account for 34%; and wild mammals are just 4%. https://o

Good question! Surprisingly, very little: Livestock make up 62% of the world’s mammal biomass; humans account for 34%; and wild mammals are just 4%. https://ourworldindata.org/wild-mammals-birds-biomass https://ourworldindata.org/wild-mammals-birds-biomass And add to that the fact that cow flatulence is very rich in methane (much more potent greenhouse gas than CO2) because of poor diet in industrial agriculture.