Most "food animals" are fed on soy.  Others are fed on grains - grains that, along w/soy, could be used to feed starving humans, but instead are dedicated to fattening up sentient animals for slaughter. If everyone on earth quit eating meat we would have more than enough food to feed each and every man, woman and child on the planet.  Please provide your sources for the alleged ammonia that is "pumped into the soil"; or are you talking about the pollution from industrial meat farming - you know, the kind that brought
 us avian and swine flu? 
It is undisputed that a plant based diet is not only the healthiest for humans, but for the entire planet. Where is your deep concern for the men, women and children who starve to death so that YOU can eat sentient animals that have been enslaved, abused, pumped up with antibiotics, tortured and slaughtered years before the end of their natural lives? 
It is corpse eaters like you who are the biggest & cruelest hypocrites by far. By far.