Here is a heartfelt, decent, educational documentary about the most important issue of our time – climate change – presented by none other than Leonardo DiCaprio, who proves his own commitment to the cause. His own interest began with an encounter with Al Gore in 2000 and has been a genuine passion with him since. DiCaprio concedes that his own celebrity status is a double-edged sword. It draws attention to the topic, but allows the naysayers to say that he is a shallow, chuckle-headed movie star and this whole issue must therefore be a fad. There are brutal Fox TV news clips to this effect.