In addition to being distracted by the plastic versus paper question, we've engaged in many sideline fights: whether pasture-finished beef is better than grain-fed from a climate change perspective; whether methane digester technology is good or bad; and whether local, conventional food or organic food shipped long distances gets the halo of being a "lower-carbon" food.
In sum, few people think about food from a climate-change perspective, and many that do are arguing over nuances. To really chip away at climate change, we need to change our diets in a very fundamental way, and that doesn't mean vegan is the only way to go.