IDK why I'm replying to such a dumb post but, exhaling carbon dioxide is what makes the world go round. What do you think plants intake? Yeah CO2, and they spit it back out as Oxygen, which we breath in and breathe back out the CO2. It's a cycle.
And you know this how? What if plants had souls or felt pain? You're just ripping them from their roots or cutting their limbs off, but of course they don't have a face or cute babies (well...baby carrots are fucking ADORABLE) so they must not have any feeling at all. The world was created with animals that were meant to be eaten and animals that were meant to eat other animals. We're in the latter part of that equation, unless you want us to revert back to the former (when we didn't eat meat)