Cowspiracy is a documentary about how cows and other animals we use for food and other products are a major source of pollution, especially in the form of greenhouse gases and damaging the environment. If we don't reduce the number of cows, or the way they are kept, it could have a bad effect on the planet. The documentary tries to make everyone aware of this problem and convince people to reduce the number of cows and find ways of keeping them that cause less pollution.