There is lots of literature, films, books, websites, posts on this subject. Here are a sample list we refer to:
http://www.ciwf.org.uk – charity closest aligned to the beliefs of an Ethical omnivore
https://www.rspca.org.uk/adviceandwelfare/farm – Lots of information and advice about terms and meanings relating to animal welfare issues
https://www.soilassociation.org – Leading organic standard in UK
https://www.amazon.co.uk/Farmageddon-True-Cost-Cheap-Meat/dp/1408846446 – a must read book for people that really want to understand this subject
https://nutritionfacts.org – a brilliant website explaining diet and health
http://www.imdb.com/title/tt1286537/ – film Food inc looks at corporate control over the food industry in USA (where we will end up if we don’t take action)
http://www.imdb.com/title/tt1814930/ – film Vegucated. About veganism but a good all round view of the industry.
http://www.imdb.com/title/tt3302820 – film Cowspiracy. Very telling account of farming practices and a global issue.
http://www.imdb.com/title/tt1567233 – film Forks over knives. Advocating a whole food plant based diet, very informative documentary about food industry.