Leonardo DiCaprio and environmental expert David Orr did a round of interviews Saturday afternoon at the Hotel du Cap outside of Cannes in support of "The 11th Hour" by Leila and Nadia Conners, a doc that explores the full scale of humanity's impact on the environment. DiCaprio narrated and produced the film, which he described as a "home made movie without a pre-determined agenda." He also paid tribute to last year's successful global warming film "An Inconvenient Truth," saying, "In my ten years as an environmental activist, I've never seen such discussion out there on the subject, and that's because of Al Gore and 'An Inconvenient Truth.'"