"The Vegetarian Myth: Food, Justice, and Sustainability" by Lierre Keith
I had come to my conclusions independently on veganism and vegetarianism years before I had encountered this book but it contains lots of personal experiences she had with the diets themselves and proponents of these diets so I highly recommend it
"Angry Inuk" by Alethea Arnaquq-Baril
This documentary isn't on meat consumption, per se. But It is an example of what can happen when propaganda is used against a people. The film can be viewed by Canadians within Canada via the CBC website for a limited time.
"Agriculture, Forestry and Other Land Use Emissions by Sources and Removals by Sinks" (PDF)
A March 2014 document from The Food and Agriculture Organization that catalogs greenhouses gasses by source.
Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2015
A 2017 Environmental Protection Agency document cataloging the greenhouse gasses in the United States from 1990 to 2015.
""Study of Current and Former Vegetarians and Vegans" (PDF)
A December 2014 study conducted by a proponent of vegetarianism that confirms most vegans and vegetarians quit.
"Q&A on the carcinogenicity of the consumption of red meat and processed meat"
The October 2015 document that confirms the World Health Organization did not conclude that we should be eliminating meat from our diets after analyzing 800+ studies.
"Vitamin B12-Containing Plant Food Sources for Vegetarians"
A May 2014 study confirming the lack of B-12 in foods that some vegans claim are reliable, potent sources.