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?
{'answer': 'Leonardo DiCaprio', 'supporting_facts': [['The 11th Hour (2007 film)', 0], ['The 11th Hour (2007 film)', 1], ['Leonardo DiCaprio', 0]]}