Controversial topic: Factory farming

I decided to research the topic of factory farming for my project because I want to learn more about it and I want to inform others about the topic. I think it's important to know what goes in your body because we are what we eat after all. Factory farming all started in the 1920's when we discovered vitamins A and D. When these vitamins are added to feed, the animals no longer require sunlight and exercises for growth. This allowed a large number of animals to be kept in doors all year round. The problem raised with having these animals kept inside all year was the spread of disease. The introduction and use of anti-biotics on the animals were used to combat the disease. This raises issues of animal welfare and agricultural health. Another issue raised due to the mass quantities of farms animals in one area is an ecological one. Mass amounts of animal waste are created and deposited into waste lagoons. These waste lagoons eventually spill and find their way into water systems. The methane gas from cow manure is more harmful than the carbon dioxide emissions from the transportation industry. Natural farming, like we used to do, doesn't exactly have this problem because animals are free to grase and relieve themselves on the grass creating fertilizer. Factory farming has turned the natural process of farming into a business production line. The nice image of the red barn and green fields with animals frolicking around, the one you see in grocery stores, is no longer a reality of farming.This is what farming really looks like now. It's hard to call it farming because it has changed so much. Currently, I'm reading Eating Animals and will find out more about this issue and post more about it. Is factory farming worth the problems it causes?