Animal agriculture uses a disproportionately large portion of habitable land per calorie (or gram of protein even) https://ourworldindata.org/land-use

The top drivers of deforestation are beef production and soy (70-75% of which is used for animal feed) https://www.worldwildlife.org/magazine/issues/summer-2018/articles/what-are-the-biggest-drivers-of-tropical-deforestation

Animal agriculture is a main driver of antibiotic resistant strains if bacteria, something the WHO calls “an increasingly serious threat to global public health that requires action across all government sectors and society.” https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4638249/