A documentary directed by Kip Andersen and Keegan Kuhn
This documentary, directed by Kip Andersen and Keegan Kuhn, present the following hypothesis:
Animal agriculture is the leading cause of deforestation, water consumption and pollution, is responsible for more greenhouse gases than the transportation industry, and is a primary driver of rainforest destruction, species extinction, habitat loss, topsoil erosion, ocean “dead zones,” and virtually every other environmental ill. Yet it goes on, almost entirely unchallenged.”
Cowspiracy: The Sustainability Secret is a groundbreaking feature-length environmental documentary following intrepid filmmaker Kip Andersen as he uncovers the most destructive industry facing the planet today – and investigates why the world’s leading environmental organizations are too afraid to talk about it.
There is however disagreement on what Cowspiracy claims – see article by Herrero et al. below.
A 5 min; video on facts from the Cowspiracy video.  From Plant Based Science London.
An article by Herrero et al. (2015) on livestock, environment and learnings.
Facts on cows, greenhouse gases, CO2, methane… from Cowspiracy.