Watch this: Before the Flood

Leonardo DiCaprio Before the Flood

Leonardo DiCaprio has made no bones about his stance on climate change and in this new feature-length documentary Before the Flood the Oscar-winner sets out to find out what a global temperature rise is currently doing to the Earth and its inhabitants, what we can do to stop it and why we aren't.

Leo and director Fisher Stevens snagged some über-celebs for the doc – look out for Barack Obama, Ban Ki-moon and the Pope – and an amazing soundtrack by Mogwai, Trent Reznor, Atticus Ross and Gustavo Santaolalla.

It's on at selected cinemas now (including at the Curzon in Bloomsbury, London) and will be shown on the National Geographic Channel on October 30th. Here's the trailer.

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