Cowspiracy: The Sustainability Secret, a documentary about finding answers for one of the most important environmental issues affecting the entire planet. co-produced by filmmakers Kip Andersen and Keegan Kuhn, Cowspiracy specifically looks into the damage that mass animal farming has on the environment and what can be changed to help curve effects. According to the documentary, more than 50% of greenhouse gasses are put into the atmosphere by agriculture and the industry has a larger greenhouse gas footprint than the entire human fossil fuel burning.
For those of you who are interested, there is a follow-up documentary to Cowspiracy called What the Health. This documentary expands on many of the issues raised in this film.