It doesn't get more serious about climate change than leaving your Hollywood mansion to travel the world, learning about how to save it from the humans destroying it. But Leonardo DiCaprio is on a mission and he wants us to listen. The Oscar-winning actor has finally revealed the trailer for his forthcoming documentary Before The Blood, which was directed by esteemed filmmaker Fisher Stevens.

The pair set out to document our planet's dramatic changing environment and the damages we're doing to our climate before it's too late. Before the Flood will hit theaters in NYC and LA starting October 21 and will air on the National Geographic Channel on October 30.