The problem I have is that people get so wrapped up in forcing their ideology on the public that they don't look at the ramifications. 

One of the things you pointed out is byproducts, if we were to reduce livestock those byproducts would be wasted.  By reducing livestock you also reduce the source of natural fertilizers.  

How about beyond that, you reduce livestock you reduce the number of jobs associated in the area.  People that live in rural areas then move to more urban areas for work. More people you have in one area the denser the pollution is in that area. 

Not only that buying habits change. Urban areas tend to have small homes which means frequent shopping trips buying smaller quantities, those that live in rural areas tend to look for multipacks and reusable items which have less packaging and waste when they have the space.

There is a cause and effect relationship in everything we do.