Leonardo DiCaprio has narrated a film, CARBON, for production company Tree Media, which aims to inspire positive social action.

CARBON explores issues relating to climate change, looking at how worldwide governments are putting a price on carbon because of its negative impact on the environment. DiCaprio commented '97% of climate scientists agree: climate change is happening now - and humans are responsible. We cannot sit idly by and watch the fossil fuel industry make billions at our collective expense. We must put a price on carbon - now'.