Although the thought of having all the earth's population being vegan, that is just not going to work because we don't havr enough land to farm the vegetables and fruits on. Also, humans are built to eat meat/dairy products (for instance we need those resources for vitamin b12). That being said, i think we should evaluate the way we kill and process animals on. There is definitely some work needed there. I only buy meat products from farms that are very animal-friendly (also the killing is done humane).