Question: 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?
Related documents: [0]  [DOC] The 11th Hour is a 2007 documentary film, created, produced, co-written and narrated by Leonardo DiCaprio, on the state of the natural environment. It was directed by Leila Conners Petersen and Nadia Conners and financed by Adam Lewis and Pierre André Senizergues, and distributed by Warner Independent Pictures. [END] 
[1]  [DOC] Leonardo Wilhelm DiCaprio ( ; born November 11, 1974) is an American actor, film producer, and environmental activist. DiCaprio began his career by appearing in television commercials in the late 1980s, after which he had recurring roles in various television series such as the soap opera "Santa Barbara" and the sitcom "Growing Pains". He began his film career by starring as Josh in "Critters 3" (1991). He starred in the film adaptation of the memoir "This Boy's Life" (1993), and was praised for his supporting role in "What's Eating Gilbert Grape" (1993). He gained public recognition with leading roles in "The Basketball Diaries" (1995) and the romantic drama "Romeo + Juliet" (1996), before achieving international fame with James Cameron's epic romance "Titanic" (1997), which became the highest-grossing film of all time until Cameron's science fiction film "Avatar" (2009) overtook it. [END] 
Answer: 
Leonardo DiCaprio
Leonardo DiCaprio