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Leonardo DiCaprio - Self - Narrator, Ki-moon Ban - Self (as Ban Ki-Moon) , Alejandro G. Iñárritu - Self, Mike Brune - Self (as Michael Brune) , Marc Mageau - Self, Enric Sala - Self (as Dr. Enric Sala) , Jake Awa - Self, Jason Box - Self (as Prof. Jason E. Box) , Philip Levine - Self, Michael E. Mann - Self (as Dr. Michael E. Mann) , Ma Jun - Self, Alvin Lin - Self, Sunita Narain - Self, Ashok Lavasa - Self, Haji Ji - Self - farmer