"The world is in terrible trouble," Sir Attenborough says. "According to the UN, over half the world’s population is now urbanised. Apart from rats and pigeons, they have probably never seen a wild animal. How are these people supposed to act? How are they supposed to feel it’s worth preserving unless they know what it is that keeps them alive, unless they understand the extent to which we are dependent on the natural world, and that we are doing terrible things to it by our very presence?"