This is a most excellent read. Dr. Frank Mitloehner goes into the whole economics and greenhouse gas thing for animal agriculture. Definitely worth a read.
He also makes this point:
Which is something I don’t think enough people realise. Nothing is going to appease the militant vegans — they’re essentially religious zealots and intend to convert the “masses” whether they like it or not. We need to find ways to defuse their message that the 98% of people, who just want to get on with their lives and not have to worry about the ecological consequences of what they’re eating, will find palatable. Doing that will essentially immunize them against vegan propaganda. Thanks to the Courtesy of :