DiCaprio, a longtime environmental activist, tackles the biggest challenge facing civilization in
Before the Flood, a new documentary. He roped some big-name pals into the movie: President Obama, Pope Francis, Elon Musk, and other famous thinkers and world leaders.
To make sure as many people as possible can see the film and get the climate message, the documentary is
streaming for free, in addition to airing on the National Geographic Channel.