The trailer has been released for Leonardo DiCaprio's new climate change documentary Before The Flood.

There's no doubt that this film is a passion project for the Oscar winning actor. DiCaprio regularly appears and speaks at environmental charity events around the world.

Before The Flood is directed by Fisher Stephens - who directed the Oscar winning documentary The Cove, in 2010. Fisher is a co-producer with Leonardo, and Martin Scorsese is an executive producer.

Notable stars featured in the film include DiCaprio, Barack Obama, Pope Francis, and John Kerry, and many more.

Watch the trailer for Before The Flood below.