Farmed animals eat way more plants than plant-eaters eat. We are growing all these plants (and cutting down rainforest to do it) because we are producing them to feed to animals and then eat those animals, rather than just eating plants.
Excerpt from my piece Yes, ‘Plant-Based Food’ Belongs i the Green New Deal:
“ Poore, along with researcher Thomas Nemecek, included data on 38,700 farms in 119 countries. They found that, if everyone ate vegan, global farmland use could be reduced by more than 75% — an area equivalent to the US, China, European Union and Australia combined. Everyone could be fed, and we could have way more wild space.”