Name the American actor, film producer and environmentalist activist who co-wrote the '11th Hour', a 2007 documentary film about the state of the natural environment, distributed by Warner Independent Pictures?
The 11th Hour (2007 film): The 11th Hour is a 2007 documentary film, created, produced, co-written and narrated by Leonardo DiCaprio, on the state of the natural environment. Leonardo DiCaprio: Leonardo Wilhelm DiCaprio ( ; born November 11, 1974) is an American actor, film producer, and environmental activist.
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