The filmmaker build credibility with facts. There is a wide variety of people that got interviewed. Some of them are very well known like Mikhail Gorbachev, Stephen Hawking, Paul Hawken and Andrew C. Revkin. Another way ethos is used is who the filmmaker chose. He chose Leonardo Dicaprio. Now this creates credibility because he is very well known. He is famous for being star characters in many movies throughout his life. The people who watch his movies means that they will watch him in a documentary. These are the people who make sure the facts get out and get