Haha, seems like OP randomly chose the wrong argument from the wrong pamphlet. Yes, livestock produces CO2. The part about it feeding on grass is a typical argu

Haha, seems like OP randomly chose the wrong argument from the wrong pamphlet. Yes, livestock produces CO2. The part about it feeding on grass is a typical argument against purely plant diet, based on the assumption that if we stop eating meat we'll starve, because we cannot produce enough plant-based food, and meat production helps, because we can turn otherwise useless plants (grass), growing on otherwise useless land, into something we can eat.